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<img class="avatar mr-2 flex-shrink-0 js-jump-to-suggestion-avatar d-none" alt="" aria-label="Team" src="" width="28" height="28">
<div class="jump-to-suggestion-name js-jump-to-suggestion-name flex-auto overflow-hidden text-left no-wrap css-truncate css-truncate-target">
</div>
<div class="border rounded-1 flex-shrink-0 bg-gray px-1 text-gray-light ml-1 f6 d-none js-jump-to-badge-search">
<span class="js-jump-to-badge-search-text-default d-none" aria-label="in this repository">
In this repository
</span>
<span class="js-jump-to-badge-search-text-global d-none" aria-label="in all of GitHub">
All GitHub
</span>
<span aria-hidden="true" class="d-inline-block ml-1 v-align-middle">↵</span>
</div>
<div aria-hidden="true" class="border rounded-1 flex-shrink-0 bg-gray px-1 text-gray-light ml-1 f6 d-none d-on-nav-focus js-jump-to-badge-jump">
Jump to
<span class="d-inline-block ml-1 v-align-middle">↵</span>
</div>
</a>
</li>
<li class="d-flex flex-justify-center flex-items-center p-0 f5 js-jump-to-suggestion">
<img src="https://github.githubassets.com/images/spinners/octocat-spinner-128.gif" alt="Octocat Spinner Icon" class="m-2" width="28">
</li>
</ul>
</div>
</label>
</form> </div>
</div>
<nav class="d-flex flex-column flex-lg-row flex-self-stretch flex-lg-self-auto" aria-label="Global">
<a class="Header-link d-block d-lg-none py-2 py-lg-0 border-top border-lg-top-0 border-white-fade-15" data-ga-click="Header, click, Nav menu - item:dashboard:user" aria-label="Dashboard" href="/dashboard">
Dashboard
</a>
<a class="js-selected-navigation-item Header-link mr-0 mr-lg-3 py-2 py-lg-0 border-top border-lg-top-0 border-white-fade-15" data-hotkey="g p" data-ga-click="Header, click, Nav menu - item:pulls context:user" aria-label="Pull requests you created" data-selected-links="/pulls /pulls/assigned /pulls/mentioned /pulls" href="/pulls">
Pull requests
</a>
<a class="js-selected-navigation-item Header-link mr-0 mr-lg-3 py-2 py-lg-0 border-top border-lg-top-0 border-white-fade-15" data-hotkey="g i" data-ga-click="Header, click, Nav menu - item:issues context:user" aria-label="Issues you created" data-selected-links="/issues /issues/assigned /issues/mentioned /issues" href="/issues">
Issues
</a>
<div class="mr-0 mr-lg-3 py-2 py-lg-0 border-top border-lg-top-0 border-white-fade-15">
<a class="js-selected-navigation-item Header-link" data-ga-click="Header, click, Nav menu - item:marketplace context:user" data-octo-click="marketplace_click" data-octo-dimensions="location:nav_bar" data-selected-links=" /marketplace" href="/marketplace">
Marketplace
</a>
</div>
<a class="js-selected-navigation-item Header-link mr-0 mr-lg-3 py-2 py-lg-0 border-top border-lg-top-0 border-white-fade-15" data-ga-click="Header, click, Nav menu - item:explore" data-selected-links="/explore /trending /trending/developers /integrations /integrations/feature/code /integrations/feature/collaborate /integrations/feature/ship showcases showcases_search showcases_landing /explore" href="/explore">
Explore
</a>
<a class="Header-link d-block d-lg-none mr-0 mr-lg-3 py-2 py-lg-0 border-top border-lg-top-0 border-white-fade-15" href="https://github.com/Tinywan">
<img class="avatar" height="20" width="20" alt="@Tinywan" src="https://avatars2.githubusercontent.com/u/14959876?s=60&v=4" />
Tinywan
</a>
<!-- '"` --><!-- </textarea></xmp> --></option></form><form action="/logout" accept-charset="UTF-8" method="post"><input name="utf8" type="hidden" value="✓" /><input type="hidden" name="authenticity_token" value="/D0QxiF8hIxYixxGUqWmG+rLF3jTAuurD4tMGVyDmg/fk0RqSX0TmHBK2BIXEeUyxZGrsVMmBv/pbnf/twwk1g==" />
<button type="submit" class="Header-link mr-0 mr-lg-3 py-2 py-lg-0 border-top border-lg-top-0 border-white-fade-15 d-lg-none btn-link d-block width-full text-left" data-ga-click="Header, sign out, icon:logout" style="padding-left: 2px;">
<svg class="octicon octicon-sign-out v-align-middle" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M12 9V7H8V5h4V3l4 3-4 3zm-2 3H6V3L2 1h8v3h1V1c0-.55-.45-1-1-1H1C.45 0 0 .45 0 1v11.38c0 .39.22.73.55.91L6 16.01V13h4c.55 0 1-.45 1-1V8h-1v4z"/></svg>
Sign out
</button>
</form></nav>
</div>
<div class="Header-item Header-item--full flex-justify-center d-lg-none position-relative">
<div class="css-truncate css-truncate-target width-fit position-absolute left-0 right-0 text-center">
<svg class="octicon octicon-repo" viewBox="0 0 12 16" version="1.1" width="12" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M4 9H3V8h1v1zm0-3H3v1h1V6zm0-2H3v1h1V4zm0-2H3v1h1V2zm8-1v12c0 .55-.45 1-1 1H6v2l-1.5-1.5L3 16v-2H1c-.55 0-1-.45-1-1V1c0-.55.45-1 1-1h10c.55 0 1 .45 1 1zm-1 10H1v2h2v-1h3v1h5v-2zm0-10H2v9h9V1z"/></svg>
<a class="Header-link" href="/songhuiqing">songhuiqing</a>
/
<a class="Header-link" href="/songhuiqing/book">book</a>
</div>
</div>
<div class="Header-item position-relative d-none d-lg-flex">
</div>
<div class="Header-item mr-0 mr-lg-3 flex-order-1 flex-lg-order-none">
<a aria-label="You have no unread notifications" class="Header-link notification-indicator position-relative tooltipped tooltipped-s js-socket-channel js-notification-indicator" data-hotkey="g n" data-ga-click="Header, go to notifications, icon:read" data-channel="notification-changed:14959876" href="/notifications">
<span class="mail-status "></span>
<svg class="octicon octicon-bell" viewBox="0 0 14 16" version="1.1" width="14" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M14 12v1H0v-1l.73-.58c.77-.77.81-2.55 1.19-4.42C2.69 3.23 6 2 6 2c0-.55.45-1 1-1s1 .45 1 1c0 0 3.39 1.23 4.16 5 .38 1.88.42 3.66 1.19 4.42l.66.58H14zm-7 4c1.11 0 2-.89 2-2H5c0 1.11.89 2 2 2z"/></svg>
</a>
</div>
<div class="Header-item position-relative d-none d-lg-flex">
<details class="details-overlay details-reset">
<summary class="Header-link"
aria-label="Create new…"
data-ga-click="Header, create new, icon:add">
<svg class="octicon octicon-plus" viewBox="0 0 12 16" version="1.1" width="12" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M12 9H7v5H5V9H0V7h5V2h2v5h5v2z"/></svg> <span class="dropdown-caret"></span>
</summary>
<details-menu class="dropdown-menu dropdown-menu-sw">
<a role="menuitem" class="dropdown-item" href="/new" data-ga-click="Header, create new repository">
New repository
</a>
<a role="menuitem" class="dropdown-item" href="/new/import" data-ga-click="Header, import a repository">
Import repository
</a>
<a role="menuitem" class="dropdown-item" href="https://gist.github.com/" data-ga-click="Header, create new gist">
New gist
</a>
<a role="menuitem" class="dropdown-item" href="/organizations/new" data-ga-click="Header, create new organization">
New organization
</a>
<div role="none" class="dropdown-divider"></div>
<div class="dropdown-header">
<span title="songhuiqing/book">This repository</span>
</div>
<a role="menuitem" class="dropdown-item" href="/songhuiqing/book/issues/new" data-ga-click="Header, create new issue" data-skip-pjax>
New issue
</a>
</details-menu>
</details>
</div>
<div class="Header-item position-relative mr-0 d-none d-lg-flex">
<details class="details-overlay details-reset">
<summary class="Header-link"
aria-label="View profile and more"
data-ga-click="Header, show menu, icon:avatar">
<img alt="@Tinywan" class="avatar" src="https://avatars1.githubusercontent.com/u/14959876?s=40&v=4" height="20" width="20">
<span class="dropdown-caret"></span>
</summary>
<details-menu class="dropdown-menu dropdown-menu-sw mt-2" style="width: 180px">
<div class="header-nav-current-user css-truncate"><a role="menuitem" class="no-underline user-profile-link px-3 pt-2 pb-2 mb-n2 mt-n1 d-block" href="/Tinywan" data-ga-click="Header, go to profile, text:Signed in as">Signed in as <strong class="css-truncate-target">Tinywan</strong></a></div>
<div role="none" class="dropdown-divider"></div>
<div class="pl-3 pr-3 f6 user-status-container js-user-status-context pb-1" data-url="/users/status?compact=1&link_mentions=0&truncate=1">
<div class="js-user-status-container
user-status-compact rounded-1 px-2 py-1 mt-2
user-status-container-border-busy
" data-team-hovercards-enabled>
<details class="js-user-status-details details-reset details-overlay details-overlay-dark">
<summary class="btn-link btn-block link-gray no-underline js-toggle-user-status-edit toggle-user-status-edit " aria-haspopup="dialog" role="menuitem" data-hydro-click="{"event_type":"user_profile.click","payload":{"profile_user_id":3807143,"target":"EDIT_USER_STATUS","user_id":14959876,"client_id":"1557564735.1565571740","originating_request_id":"D666:1866:F0B8B:155978:5D5B85B4","originating_url":"https://github.com/songhuiqing/book/blob/master/%E9%B8%9F%E5%93%A5%E7%9A%84Linux%E7%A7%81%E6%88%BF%E8%8F%9C%E6%9C%8D%E5%8A%A1%E5%99%A8%E6%9E%B6%E8%AE%BE%E7%AF%87(%E7%AC%AC%E4%B8%89%E7%89%88).pdf","referrer":"https://github.com/songhuiqing/book"}}" data-hydro-click-hmac="e62bc357faf457d232546cf4c330857bcf2244593d72d64d60794b5d9e64c063">
<div class="d-flex">
<div class="f6 lh-condensed user-status-header
d-inline-flex
user-status-limited-availability
"
>
<div class="user-status-emoji-container flex-shrink-0 mr-1 " style="margin-top: 2px;">
<div><img class="emoji" title=":atom:" alt=":atom:" src="https://github.githubassets.com/images/icons/emoji/atom.png" height="20" width="20" align="absmiddle"></div>
</div>
</div>
<div class="
css-truncate css-truncate-target
user-status-message-wrapper f6"
style="line-height: 20px;" >
<div class="d-inline-block text-gray-dark v-align-text-top text-left">
<div class="ws-normal text-gray-dark text-bold f6">
IOT
</div>
<span>扫描关注个人微信公众号</span>
</div>
</div>
</div>
</summary> <details-dialog class="details-dialog rounded-1 anim-fade-in fast Box Box--overlay" role="dialog" tabindex="-1">
<!-- '"` --><!-- </textarea></xmp> --></option></form><form class="position-relative flex-auto js-user-status-form" action="/users/status?compact=1&link_mentions=0&truncate=1" accept-charset="UTF-8" method="post"><input name="utf8" type="hidden" value="✓" /><input type="hidden" name="_method" value="put" /><input type="hidden" name="authenticity_token" value="t7AaU/F7tkWeLA+ODbrGTuPXAdbhR0IWhBLaXAemM1+I0IM/IS6Igr28rpZh8sBE0W2/+Q+SiUrMd3/9V49BZQ==" />
<div class="Box-header bg-gray border-bottom p-3">
<button class="Box-btn-octicon js-toggle-user-status-edit btn-octicon float-right" type="reset" aria-label="Close dialog" data-close-dialog>
<svg class="octicon octicon-x" viewBox="0 0 12 16" version="1.1" width="12" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M7.48 8l3.75 3.75-1.48 1.48L6 9.48l-3.75 3.75-1.48-1.48L4.52 8 .77 4.25l1.48-1.48L6 6.52l3.75-3.75 1.48 1.48L7.48 8z"/></svg>
</button>
<h3 class="Box-title f5 text-bold text-gray-dark">Edit status</h3>
</div>
<input type="hidden" name="emoji" class="js-user-status-emoji-field" value=":atom:">
<input type="hidden" name="organization_id" class="js-user-status-org-id-field" value="MDEyOk9yZ2FuaXphdGlvbjI5OTIzOTEw">
<div class="px-3 py-2 text-gray-dark">
<div class="js-characters-remaining-container position-relative mt-2">
<div class="input-group d-table form-group my-0 js-user-status-form-group">
<span class="input-group-button d-table-cell v-align-middle" style="width: 1%">
<button type="button" aria-label="Choose an emoji" class="btn-outline btn js-toggle-user-status-emoji-picker btn-open-emoji-picker p-0">
<span class="js-user-status-original-emoji" hidden><div><img class="emoji" title=":atom:" alt=":atom:" src="https://github.githubassets.com/images/icons/emoji/atom.png" height="20" width="20" align="absmiddle"></div></span>
<span class="js-user-status-custom-emoji"><div><img class="emoji" title=":atom:" alt=":atom:" src="https://github.githubassets.com/images/icons/emoji/atom.png" height="20" width="20" align="absmiddle"></div></span>
<span class="js-user-status-no-emoji-icon" hidden>
<svg class="octicon octicon-smiley" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M8 0C3.58 0 0 3.58 0 8s3.58 8 8 8 8-3.58 8-8-3.58-8-8-8zm4.81 12.81a6.72 6.72 0 0 1-2.17 1.45c-.83.36-1.72.53-2.64.53-.92 0-1.81-.17-2.64-.53-.81-.34-1.55-.83-2.17-1.45a6.773 6.773 0 0 1-1.45-2.17A6.59 6.59 0 0 1 1.21 8c0-.92.17-1.81.53-2.64.34-.81.83-1.55 1.45-2.17.62-.62 1.36-1.11 2.17-1.45A6.59 6.59 0 0 1 8 1.21c.92 0 1.81.17 2.64.53.81.34 1.55.83 2.17 1.45.62.62 1.11 1.36 1.45 2.17.36.83.53 1.72.53 2.64 0 .92-.17 1.81-.53 2.64-.34.81-.83 1.55-1.45 2.17zM4 6.8v-.59c0-.66.53-1.19 1.2-1.19h.59c.66 0 1.19.53 1.19 1.19v.59c0 .67-.53 1.2-1.19 1.2H5.2C4.53 8 4 7.47 4 6.8zm5 0v-.59c0-.66.53-1.19 1.2-1.19h.59c.66 0 1.19.53 1.19 1.19v.59c0 .67-.53 1.2-1.19 1.2h-.59C9.53 8 9 7.47 9 6.8zm4 3.2c-.72 1.88-2.91 3-5 3s-4.28-1.13-5-3c-.14-.39.23-1 .66-1h8.59c.41 0 .89.61.75 1z"/></svg>
</span>
</button>
</span>
<text-expander keys=": @" data-mention-url="/suggestions?global_id=MDEyOk9yZ2FuaXphdGlvbjI5OTIzOTEw&mention_suggester=1" data-emoji-url="/autocomplete/emoji">
<input
type="text"
autocomplete="off"
data-no-org-url="/autocomplete/user-suggestions"
data-org-url="/suggestions?mention_suggester=1"
data-maxlength="80"
class="d-table-cell width-full form-control js-user-status-message-field js-characters-remaining-field"
placeholder="What's happening?"
name="message"
value="扫描关注个人微信公众号"
aria-label="What is your current status?">
</text-expander>
<div class="error">Could not update your status, please try again.</div>
</div>
<div style="margin-left: 53px" class="my-1 text-small label-characters-remaining js-characters-remaining" data-suffix="remaining" hidden>
80 remaining
</div>
</div>
<include-fragment class="js-user-status-emoji-picker" data-url="/users/status/emoji"></include-fragment>
<div class="overflow-auto ml-n3 mr-n3 px-3 border-bottom" style="max-height: 33vh">
<div class="user-status-suggestions js-user-status-suggestions collapsed overflow-hidden">
<h4 class="f6 text-normal my-3">Suggestions:</h4>
<div class="mx-3 mt-2 clearfix">
<div class="float-left col-6">
<button type="button" value=":palm_tree:" class="d-flex flex-items-baseline flex-items-stretch lh-condensed f6 btn-link link-gray no-underline js-predefined-user-status mb-1">
<div class="emoji-status-width mr-2 v-align-middle js-predefined-user-status-emoji">
<g-emoji alias="palm_tree" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f334.png">🌴</g-emoji>
</div>
<div class="d-flex flex-items-center no-underline js-predefined-user-status-message ws-normal text-left" style="border-left: 1px solid transparent">
On vacation
</div>
</button>
<button type="button" value=":face_with_thermometer:" class="d-flex flex-items-baseline flex-items-stretch lh-condensed f6 btn-link link-gray no-underline js-predefined-user-status mb-1">
<div class="emoji-status-width mr-2 v-align-middle js-predefined-user-status-emoji">
<g-emoji alias="face_with_thermometer" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f912.png">🤒</g-emoji>
</div>
<div class="d-flex flex-items-center no-underline js-predefined-user-status-message ws-normal text-left" style="border-left: 1px solid transparent">
Out sick
</div>
</button>
</div>
<div class="float-left col-6">
<button type="button" value=":house:" class="d-flex flex-items-baseline flex-items-stretch lh-condensed f6 btn-link link-gray no-underline js-predefined-user-status mb-1">
<div class="emoji-status-width mr-2 v-align-middle js-predefined-user-status-emoji">
<g-emoji alias="house" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f3e0.png">🏠</g-emoji>
</div>
<div class="d-flex flex-items-center no-underline js-predefined-user-status-message ws-normal text-left" style="border-left: 1px solid transparent">
Working from home
</div>
</button>
<button type="button" value=":dart:" class="d-flex flex-items-baseline flex-items-stretch lh-condensed f6 btn-link link-gray no-underline js-predefined-user-status mb-1">
<div class="emoji-status-width mr-2 v-align-middle js-predefined-user-status-emoji">
<g-emoji alias="dart" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f3af.png">🎯</g-emoji>
</div>
<div class="d-flex flex-items-center no-underline js-predefined-user-status-message ws-normal text-left" style="border-left: 1px solid transparent">
Focusing
</div>
</button>
</div>
</div>
</div>
<div class="user-status-limited-availability-container">
<div class="form-checkbox my-0">
<input type="checkbox" name="limited_availability" value="1" class="js-user-status-limited-availability-checkbox" data-default-message="I may be slow to respond." aria-describedby="limited-availability-help-text-truncate-true-compact-true" id="limited-availability-truncate-true-compact-true" checked>
<label class="d-block f5 text-gray-dark mb-1" for="limited-availability-truncate-true-compact-true">
Busy
</label>
<p class="note" id="limited-availability-help-text-truncate-true-compact-true">
When others mention you, assign you, or request your review,
GitHub will let them know that you have limited availability.
</p>
</div>
</div>
</div>
<div class="d-inline-block f5 mr-2 pt-3 pb-2" >
<div class="d-inline-block mr-1">
Clear status
</div>
<details class="js-user-status-expire-drop-down f6 dropdown details-reset details-overlay d-inline-block mr-2">
<summary class="f5 btn-link link-gray-dark border px-2 py-1 rounded-1" aria-haspopup="true">
<div class="js-user-status-expiration-interval-selected d-inline-block v-align-baseline">
Never
</div>
<div class="dropdown-caret"></div>
</summary>
<ul class="dropdown-menu dropdown-menu-se pl-0 overflow-auto" style="width: 220px; max-height: 15.5em">
<li>
<button type="button" class="btn-link dropdown-item js-user-status-expire-button ws-normal" title="Never">
<span class="d-inline-block text-bold mb-1">Never</span>
<div class="f6 lh-condensed">Keep this status until you clear your status or edit your status.</div>
</button>
</li>
<li class="dropdown-divider" role="none"></li>
<li>
<button type="button" class="btn-link dropdown-item ws-normal js-user-status-expire-button" title="in 30 minutes" value="2019-08-20T14:01:36+08:00">
in 30 minutes
</button>
</li>
<li>
<button type="button" class="btn-link dropdown-item ws-normal js-user-status-expire-button" title="in 1 hour" value="2019-08-20T14:31:36+08:00">
in 1 hour
</button>
</li>
<li>
<button type="button" class="btn-link dropdown-item ws-normal js-user-status-expire-button" title="in 4 hours" value="2019-08-20T17:31:36+08:00">
in 4 hours
</button>
</li>
<li>
<button type="button" class="btn-link dropdown-item ws-normal js-user-status-expire-button" title="today" value="2019-08-20T23:59:59+08:00">
today
</button>
</li>
<li>
<button type="button" class="btn-link dropdown-item ws-normal js-user-status-expire-button" title="this week" value="2019-08-25T23:59:59+08:00">
this week
</button>
</li>
</ul>
</details>
<input class="js-user-status-expiration-date-input" type="hidden" name="expires_at" value="">
</div>
<include-fragment class="js-user-status-org-picker" data-url="/users/status/organizations"></include-fragment>
</div>
<div class="d-flex flex-items-center flex-justify-between p-3 border-top">
<button type="submit" class="width-full btn btn-primary mr-2 js-user-status-submit">
Set status
</button>
<button type="button" class="width-full js-clear-user-status-button btn ml-2 js-user-status-exists">
Clear status
</button>
</div>
</form> </details-dialog>
</details>
</div>
</div>
<div role="none" class="dropdown-divider"></div>
<a role="menuitem" class="dropdown-item" href="/Tinywan" data-ga-click="Header, go to profile, text:your profile">Your profile</a>
<a role="menuitem" class="dropdown-item" href="/Tinywan?tab=repositories" data-ga-click="Header, go to repositories, text:your repositories">Your repositories</a>
<a role="menuitem" class="dropdown-item" href="/Tinywan?tab=projects" data-ga-click="Header, go to projects, text:your projects">Your projects</a>
<a role="menuitem" class="dropdown-item" href="/Tinywan?tab=stars" data-ga-click="Header, go to starred repos, text:your stars">Your stars</a>
<a role="menuitem" class="dropdown-item" href="https://gist.github.com/mine" data-ga-click="Header, your gists, text:your gists">Your gists</a>
<div role="none" class="dropdown-divider"></div>
<a role="menuitem" class="dropdown-item" href="https://help.github.com" data-ga-click="Header, go to help, text:help">Help</a>
<a role="menuitem" class="dropdown-item" href="/settings/profile" data-ga-click="Header, go to settings, icon:settings">Settings</a>
<!-- '"` --><!-- </textarea></xmp> --></option></form><form class="logout-form" action="/logout" accept-charset="UTF-8" method="post"><input name="utf8" type="hidden" value="✓" /><input type="hidden" name="authenticity_token" value="huMU48xXcmfyrBHZFISY7/pygNRoQ9fm0H18cZJEcg+lTUBPpFblc9pt1Y1RMNvG1Sg8HehnOrI2mEeXecvM1g==" />
<button type="submit" class="dropdown-item dropdown-signout" data-ga-click="Header, sign out, icon:logout" role="menuitem">
Sign out
</button>
</form> </details-menu>
</details>
</div>
</header>
</div>
<div id="start-of-content" class="show-on-focus"></div>
<div id="js-flash-container">
</div>
<div class="application-main " data-commit-hovercards-enabled>
<div itemscope itemtype="http://schema.org/SoftwareSourceCode" class="">
<main >
<div class="pagehead repohead instapaper_ignore readability-menu experiment-repo-nav pt-0 pt-lg-4 ">
<div class="repohead-details-container clearfix container-lg p-responsive d-none d-lg-block">
<ul class="pagehead-actions">
<li hidden>
<include-fragment src="/songhuiqing/book/used_by_count">
</include-fragment>
</li>
<li>
<!-- '"` --><!-- </textarea></xmp> --></option></form><form data-remote="true" class="clearfix js-social-form js-social-container" action="/notifications/subscribe" accept-charset="UTF-8" method="post"><input name="utf8" type="hidden" value="✓" /><input type="hidden" name="authenticity_token" value="fUz3T7s1KHNPi4uocJ4BHcfL9nSZHJd7sHZgimmZXyj5rgJ6qHP1utVHZ90mR9L3/GQxqdkecjQojvyYsCpSVA==" /> <input type="hidden" name="repository_id" value="127068365">
<details class="details-reset details-overlay select-menu float-left">
<summary class="select-menu-button float-left btn btn-sm btn-with-count" data-hydro-click="{"event_type":"repository.click","payload":{"target":"WATCH_BUTTON","repository_id":127068365,"client_id":"1557564735.1565571740","originating_request_id":"D666:1866:F0B8B:155978:5D5B85B4","originating_url":"https://github.com/songhuiqing/book/blob/master/%E9%B8%9F%E5%93%A5%E7%9A%84Linux%E7%A7%81%E6%88%BF%E8%8F%9C%E6%9C%8D%E5%8A%A1%E5%99%A8%E6%9E%B6%E8%AE%BE%E7%AF%87(%E7%AC%AC%E4%B8%89%E7%89%88).pdf","referrer":"https://github.com/songhuiqing/book","user_id":14959876}}" data-hydro-click-hmac="fb80de1221dcc88b9bb4b8a9e9ef916602d52292f565024c7eda2ff8f5af58d2" data-ga-click="Repository, click Watch settings, action:blob#show"> <span data-menu-button>
<svg class="octicon octicon-eye v-align-text-bottom" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M8.06 2C3 2 0 8 0 8s3 6 8.06 6C13 14 16 8 16 8s-3-6-7.94-6zM8 12c-2.2 0-4-1.78-4-4 0-2.2 1.8-4 4-4 2.22 0 4 1.8 4 4 0 2.22-1.78 4-4 4zm2-4c0 1.11-.89 2-2 2-1.11 0-2-.89-2-2 0-1.11.89-2 2-2 1.11 0 2 .89 2 2z"/></svg>
Watch
</span>
</summary> <details-menu
class="select-menu-modal position-absolute mt-5"
style="z-index: 99;">
<div class="select-menu-header">
<span class="select-menu-title">Notifications</span>
</div>
<div class="select-menu-list">
<button type="submit" name="do" value="included" class="select-menu-item width-full" aria-checked="true" role="menuitemradio">
<svg class="octicon octicon-check select-menu-item-icon" viewBox="0 0 12 16" version="1.1" width="12" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M12 5l-8 8-4-4 1.5-1.5L4 10l6.5-6.5L12 5z"/></svg>
<div class="select-menu-item-text">
<span class="select-menu-item-heading">Not watching</span>
<span class="description">Be notified only when participating or @mentioned.</span>
<span class="hidden-select-button-text" data-menu-button-contents>
<svg class="octicon octicon-eye v-align-text-bottom" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M8.06 2C3 2 0 8 0 8s3 6 8.06 6C13 14 16 8 16 8s-3-6-7.94-6zM8 12c-2.2 0-4-1.78-4-4 0-2.2 1.8-4 4-4 2.22 0 4 1.8 4 4 0 2.22-1.78 4-4 4zm2-4c0 1.11-.89 2-2 2-1.11 0-2-.89-2-2 0-1.11.89-2 2-2 1.11 0 2 .89 2 2z"/></svg>
Watch
</span>
</div>
</button>
<button type="submit" name="do" value="release_only" class="select-menu-item width-full" aria-checked="false" role="menuitemradio">
<svg class="octicon octicon-check select-menu-item-icon" viewBox="0 0 12 16" version="1.1" width="12" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M12 5l-8 8-4-4 1.5-1.5L4 10l6.5-6.5L12 5z"/></svg>
<div class="select-menu-item-text">
<span class="select-menu-item-heading">Releases only</span>
<span class="description">Be notified of new releases, and when participating or @mentioned.</span>
<span class="hidden-select-button-text" data-menu-button-contents>
<svg class="octicon octicon-eye v-align-text-bottom" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M8.06 2C3 2 0 8 0 8s3 6 8.06 6C13 14 16 8 16 8s-3-6-7.94-6zM8 12c-2.2 0-4-1.78-4-4 0-2.2 1.8-4 4-4 2.22 0 4 1.8 4 4 0 2.22-1.78 4-4 4zm2-4c0 1.11-.89 2-2 2-1.11 0-2-.89-2-2 0-1.11.89-2 2-2 1.11 0 2 .89 2 2z"/></svg>
Unwatch releases
</span>
</div>
</button>
<button type="submit" name="do" value="subscribed" class="select-menu-item width-full" aria-checked="false" role="menuitemradio">
<svg class="octicon octicon-check select-menu-item-icon" viewBox="0 0 12 16" version="1.1" width="12" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M12 5l-8 8-4-4 1.5-1.5L4 10l6.5-6.5L12 5z"/></svg>
<div class="select-menu-item-text">
<span class="select-menu-item-heading">Watching</span>
<span class="description">Be notified of all conversations.</span>
<span class="hidden-select-button-text" data-menu-button-contents>
<svg class="octicon octicon-eye v-align-text-bottom" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M8.06 2C3 2 0 8 0 8s3 6 8.06 6C13 14 16 8 16 8s-3-6-7.94-6zM8 12c-2.2 0-4-1.78-4-4 0-2.2 1.8-4 4-4 2.22 0 4 1.8 4 4 0 2.22-1.78 4-4 4zm2-4c0 1.11-.89 2-2 2-1.11 0-2-.89-2-2 0-1.11.89-2 2-2 1.11 0 2 .89 2 2z"/></svg>
Unwatch
</span>
</div>
</button>
<button type="submit" name="do" value="ignore" class="select-menu-item width-full" aria-checked="false" role="menuitemradio">
<svg class="octicon octicon-check select-menu-item-icon" viewBox="0 0 12 16" version="1.1" width="12" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M12 5l-8 8-4-4 1.5-1.5L4 10l6.5-6.5L12 5z"/></svg>
<div class="select-menu-item-text">
<span class="select-menu-item-heading">Ignoring</span>
<span class="description">Never be notified.</span>
<span class="hidden-select-button-text" data-menu-button-contents>
<svg class="octicon octicon-mute v-align-text-bottom" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M8 2.81v10.38c0 .67-.81 1-1.28.53L3 10H1c-.55 0-1-.45-1-1V7c0-.55.45-1 1-1h2l3.72-3.72C7.19 1.81 8 2.14 8 2.81zm7.53 3.22l-1.06-1.06-1.97 1.97-1.97-1.97-1.06 1.06L11.44 8 9.47 9.97l1.06 1.06 1.97-1.97 1.97 1.97 1.06-1.06L13.56 8l1.97-1.97z"/></svg>
Stop ignoring
</span>
</div>
</button>
</div>
</details-menu>
</details>
<a class="social-count js-social-count"
href="/songhuiqing/book/watchers"
aria-label="29 users are watching this repository">
29
</a>
</form>
</li>
<li>
<div class="js-toggler-container js-social-container starring-container ">
<!-- '"` --><!-- </textarea></xmp> --></option></form><form class="starred js-social-form" action="/songhuiqing/book/unstar" accept-charset="UTF-8" method="post"><input name="utf8" type="hidden" value="✓" /><input type="hidden" name="authenticity_token" value="UHQ9klG2vwoz9mvjpNUSZ6mCYhkenGw1H/9RblvnSbCjRmItG8vYocZ0iB4KaRZXr22X7cQQB8yIi1gUe7C3dg==" />
<input type="hidden" name="context" value="repository"></input>
<button type="submit" class="btn btn-sm btn-with-count js-toggler-target" aria-label="Unstar this repository" title="Unstar songhuiqing/book" data-hydro-click="{"event_type":"repository.click","payload":{"target":"UNSTAR_BUTTON","repository_id":127068365,"client_id":"1557564735.1565571740","originating_request_id":"D666:1866:F0B8B:155978:5D5B85B4","originating_url":"https://github.com/songhuiqing/book/blob/master/%E9%B8%9F%E5%93%A5%E7%9A%84Linux%E7%A7%81%E6%88%BF%E8%8F%9C%E6%9C%8D%E5%8A%A1%E5%99%A8%E6%9E%B6%E8%AE%BE%E7%AF%87(%E7%AC%AC%E4%B8%89%E7%89%88).pdf","referrer":"https://github.com/songhuiqing/book","user_id":14959876}}" data-hydro-click-hmac="a13701fba3760a211460810cdeb16dd39f91f3d622a12242b25a471226076f02" data-ga-click="Repository, click unstar button, action:blob#show; text:Unstar"> <svg class="octicon octicon-star v-align-text-bottom" viewBox="0 0 14 16" version="1.1" width="14" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M14 6l-4.9-.64L7 1 4.9 5.36 0 6l3.6 3.26L2.67 14 7 11.67 11.33 14l-.93-4.74L14 6z"/></svg>
Unstar
</button> <a class="social-count js-social-count" href="/songhuiqing/book/stargazers"
aria-label="646 users starred this repository">
646
</a>
</form>
<!-- '"` --><!-- </textarea></xmp> --></option></form><form class="unstarred js-social-form" action="/songhuiqing/book/star" accept-charset="UTF-8" method="post"><input name="utf8" type="hidden" value="✓" /><input type="hidden" name="authenticity_token" value="XyhRn310oAOvTIZptXaMg0KjITSa986Vb7gK0hg9Qmv7wiOmOK0LzhYxv9VnGdzoap8AIJzp6qQgOZHyV5aLBg==" />
<input type="hidden" name="context" value="repository"></input>
<button type="submit" class="btn btn-sm btn-with-count js-toggler-target" aria-label="Unstar this repository" title="Star songhuiqing/book" data-hydro-click="{"event_type":"repository.click","payload":{"target":"STAR_BUTTON","repository_id":127068365,"client_id":"1557564735.1565571740","originating_request_id":"D666:1866:F0B8B:155978:5D5B85B4","originating_url":"https://github.com/songhuiqing/book/blob/master/%E9%B8%9F%E5%93%A5%E7%9A%84Linux%E7%A7%81%E6%88%BF%E8%8F%9C%E6%9C%8D%E5%8A%A1%E5%99%A8%E6%9E%B6%E8%AE%BE%E7%AF%87(%E7%AC%AC%E4%B8%89%E7%89%88).pdf","referrer":"https://github.com/songhuiqing/book","user_id":14959876}}" data-hydro-click-hmac="69fd37a4d3fd0a64681c9e3b382ec77271f89309fa21a27c511f018853cacf12" data-ga-click="Repository, click star button, action:blob#show; text:Star"> <svg class="octicon octicon-star v-align-text-bottom" viewBox="0 0 14 16" version="1.1" width="14" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M14 6l-4.9-.64L7 1 4.9 5.36 0 6l3.6 3.26L2.67 14 7 11.67 11.33 14l-.93-4.74L14 6z"/></svg>
Star
</button> <a class="social-count js-social-count" href="/songhuiqing/book/stargazers"
aria-label="646 users starred this repository">
646
</a>
</form> </div>
</li>
<li>
<details class="details-reset details-overlay details-overlay-dark d-inline-block float-left">
<summary class="btn btn-sm btn-with-count" data-hydro-click="{"event_type":"repository.click","payload":{"target":"FORK_BUTTON","repository_id":127068365,"client_id":"1557564735.1565571740","originating_request_id":"D666:1866:F0B8B:155978:5D5B85B4","originating_url":"https://github.com/songhuiqing/book/blob/master/%E9%B8%9F%E5%93%A5%E7%9A%84Linux%E7%A7%81%E6%88%BF%E8%8F%9C%E6%9C%8D%E5%8A%A1%E5%99%A8%E6%9E%B6%E8%AE%BE%E7%AF%87(%E7%AC%AC%E4%B8%89%E7%89%88).pdf","referrer":"https://github.com/songhuiqing/book","user_id":14959876}}" data-hydro-click-hmac="8adc99ff025c4993c754de620823fb561c7553b6ae38f2ba0de1665fd5d8946b" data-ga-click="Repository, show fork modal, action:blob#show; text:Fork" title="Fork your own copy of songhuiqing/book to your account"> <svg class="octicon octicon-repo-forked v-align-text-bottom" viewBox="0 0 10 16" version="1.1" width="10" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M8 1a1.993 1.993 0 0 0-1 3.72V6L5 8 3 6V4.72A1.993 1.993 0 0 0 2 1a1.993 1.993 0 0 0-1 3.72V6.5l3 3v1.78A1.993 1.993 0 0 0 5 15a1.993 1.993 0 0 0 1-3.72V9.5l3-3V4.72A1.993 1.993 0 0 0 8 1zM2 4.2C1.34 4.2.8 3.65.8 3c0-.65.55-1.2 1.2-1.2.65 0 1.2.55 1.2 1.2 0 .65-.55 1.2-1.2 1.2zm3 10c-.66 0-1.2-.55-1.2-1.2 0-.65.55-1.2 1.2-1.2.65 0 1.2.55 1.2 1.2 0 .65-.55 1.2-1.2 1.2zm3-10c-.66 0-1.2-.55-1.2-1.2 0-.65.55-1.2 1.2-1.2.65 0 1.2.55 1.2 1.2 0 .65-.55 1.2-1.2 1.2z"/></svg>
Fork
</summary> <details-dialog
class="anim-fade-in fast Box Box--overlay d-flex flex-column"
src="/songhuiqing/book/fork?fragment=1"
preload>
<div class="Box-header">
<button class="Box-btn-octicon btn-octicon float-right" type="button" aria-label="Close dialog" data-close-dialog>
<svg class="octicon octicon-x" viewBox="0 0 12 16" version="1.1" width="12" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M7.48 8l3.75 3.75-1.48 1.48L6 9.48l-3.75 3.75-1.48-1.48L4.52 8 .77 4.25l1.48-1.48L6 6.52l3.75-3.75 1.48 1.48L7.48 8z"/></svg>
</button>
<h3 class="Box-title">Fork book</h3>
</div>
<div class="overflow-auto text-center">
<include-fragment>
<div class="octocat-spinner my-3" aria-label="Loading..."></div>
<p class="f5 text-gray">If this dialog fails to load, you can visit <a href="/songhuiqing/book/fork">the fork page</a> directly.</p>
</include-fragment>
</div>
</details-dialog>
</details>
<a href="/songhuiqing/book/network/members" class="social-count"
aria-label="243 users forked this repository">
243
</a>
</li>
</ul>
<h1 class="public ">
<svg class="octicon octicon-repo" viewBox="0 0 12 16" version="1.1" width="12" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M4 9H3V8h1v1zm0-3H3v1h1V6zm0-2H3v1h1V4zm0-2H3v1h1V2zm8-1v12c0 .55-.45 1-1 1H6v2l-1.5-1.5L3 16v-2H1c-.55 0-1-.45-1-1V1c0-.55.45-1 1-1h10c.55 0 1 .45 1 1zm-1 10H1v2h2v-1h3v1h5v-2zm0-10H2v9h9V1z"/></svg>
<span class="author" itemprop="author"><a class="url fn" rel="author" data-hovercard-type="user" data-hovercard-url="/hovercards?user_id=3807143" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/songhuiqing">songhuiqing</a></span><!--
--><span class="path-divider">/</span><!--
--><strong itemprop="name"><a data-pjax="#js-repo-pjax-container" href="/songhuiqing/book">book</a></strong>
</h1>
</div>
<nav class="hx_reponav reponav js-repo-nav js-sidenav-container-pjax container-lg p-responsive d-none d-lg-block"
itemscope
itemtype="http://schema.org/BreadcrumbList"
aria-label="Repository"
data-pjax="#js-repo-pjax-container">
<span itemscope itemtype="http://schema.org/ListItem" itemprop="itemListElement">
<a class="js-selected-navigation-item selected reponav-item" itemprop="url" data-hotkey="g c" aria-current="page" data-selected-links="repo_source repo_downloads repo_commits repo_releases repo_tags repo_branches repo_packages /songhuiqing/book" href="/songhuiqing/book">
<svg class="octicon octicon-code" viewBox="0 0 14 16" version="1.1" width="14" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M9.5 3L8 4.5 11.5 8 8 11.5 9.5 13 14 8 9.5 3zm-5 0L0 8l4.5 5L6 11.5 2.5 8 6 4.5 4.5 3z"/></svg>
<span itemprop="name">Code</span>
<meta itemprop="position" content="1">
</a> </span>
<span itemscope itemtype="http://schema.org/ListItem" itemprop="itemListElement">
<a itemprop="url" data-hotkey="g i" class="js-selected-navigation-item reponav-item" data-selected-links="repo_issues repo_labels repo_milestones /songhuiqing/book/issues" href="/songhuiqing/book/issues">
<svg class="octicon octicon-issue-opened" viewBox="0 0 14 16" version="1.1" width="14" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"/></svg>
<span itemprop="name">Issues</span>
<span class="Counter">0</span>
<meta itemprop="position" content="2">
</a> </span>
<span itemscope itemtype="http://schema.org/ListItem" itemprop="itemListElement">
<a data-hotkey="g p" itemprop="url" class="js-selected-navigation-item reponav-item" data-selected-links="repo_pulls checks /songhuiqing/book/pulls" href="/songhuiqing/book/pulls">
<svg class="octicon octicon-git-pull-request" viewBox="0 0 12 16" version="1.1" width="12" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M11 11.28V5c-.03-.78-.34-1.47-.94-2.06C9.46 2.35 8.78 2.03 8 2H7V0L4 3l3 3V4h1c.27.02.48.11.69.31.21.2.3.42.31.69v6.28A1.993 1.993 0 0 0 10 15a1.993 1.993 0 0 0 1-3.72zm-1 2.92c-.66 0-1.2-.55-1.2-1.2 0-.65.55-1.2 1.2-1.2.65 0 1.2.55 1.2 1.2 0 .65-.55 1.2-1.2 1.2zM4 3c0-1.11-.89-2-2-2a1.993 1.993 0 0 0-1 3.72v6.56A1.993 1.993 0 0 0 2 15a1.993 1.993 0 0 0 1-3.72V4.72c.59-.34 1-.98 1-1.72zm-.8 10c0 .66-.55 1.2-1.2 1.2-.65 0-1.2-.55-1.2-1.2 0-.65.55-1.2 1.2-1.2.65 0 1.2.55 1.2 1.2zM2 4.2C1.34 4.2.8 3.65.8 3c0-.65.55-1.2 1.2-1.2.65 0 1.2.55 1.2 1.2 0 .65-.55 1.2-1.2 1.2z"/></svg>
<span itemprop="name">Pull requests</span>
<span class="Counter">0</span>
<meta itemprop="position" content="3">
</a> </span>
<a data-hotkey="g b" class="js-selected-navigation-item reponav-item" data-selected-links="repo_projects new_repo_project repo_project /songhuiqing/book/projects" href="/songhuiqing/book/projects">
<svg class="octicon octicon-project" viewBox="0 0 15 16" version="1.1" width="15" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M10 12h3V2h-3v10zm-4-2h3V2H6v8zm-4 4h3V2H2v12zm-1 1h13V1H1v14zM14 0H1a1 1 0 0 0-1 1v14a1 1 0 0 0 1 1h13a1 1 0 0 0 1-1V1a1 1 0 0 0-1-1z"/></svg>
Projects
<span class="Counter" >0</span>
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<svg class="octicon octicon-alert" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M8.893 1.5c-.183-.31-.52-.5-.887-.5s-.703.19-.886.5L.138 13.499a.98.98 0 0 0 0 1.001c.193.31.53.501.886.501h13.964c.367 0 .704-.19.877-.5a1.03 1.03 0 0 0 .01-1.002L8.893 1.5zm.133 11.497H6.987v-2.003h2.039v2.003zm0-3.004H6.987V5.987h2.039v4.006z"/></svg>
<span class="signed-in-tab-flash">You signed in with another tab or window. <a href="">Reload</a> to refresh your session.</span>
<span class="signed-out-tab-flash">You signed out in another tab or window. <a href="">Reload</a> to refresh your session.</span>
</div>
<template id="site-details-dialog">
<details class="details-reset details-overlay details-overlay-dark lh-default text-gray-dark hx_rsm" open>
<summary role="button" aria-label="Close dialog"></summary>
<details-dialog class="Box Box--overlay d-flex flex-column anim-fade-in fast hx_rsm-dialog hx_rsm-modal">
<button class="Box-btn-octicon m-0 btn-octicon position-absolute right-0 top-0" type="button" aria-label="Close dialog" data-close-dialog>
<svg class="octicon octicon-x" viewBox="0 0 12 16" version="1.1" width="12" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M7.48 8l3.75 3.75-1.48 1.48L6 9.48l-3.75 3.75-1.48-1.48L4.52 8 .77 4.25l1.48-1.48L6 6.52l3.75-3.75 1.48 1.48L7.48 8z"/></svg>
</button>
<div class="octocat-spinner my-6 js-details-dialog-spinner"></div>
</details-dialog>
</details>
</template>
<div class="Popover js-hovercard-content position-absolute" style="display: none; outline: none;" tabindex="0">
<div class="Popover-message Popover-message--bottom-left Popover-message--large Box box-shadow-large" style="width:360px;">
</div>
</div>
<div aria-live="polite" class="js-global-screen-reader-notice sr-only"></div>
</body>
</html>
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