📄 cd.html

📁 unix 下的C开发手册,还用详细的例程。
💻 HTML
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>cd</title></head><body bgcolor=white><center><font size=2>The Single UNIX &reg; Specification, Version 2<br>Copyright &copy; 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_000_305">&nbsp;</a>NAME</h4><blockquote>cd - change the working directory</blockquote><h4><a name = "tag_000_000_306">&nbsp;</a>SYNOPSIS</h4><blockquote><pre><code>cd <b>[</b><i>directory</i><b>]</b>cd - </code></pre></blockquote><h4><a name = "tag_000_000_307">&nbsp;</a>DESCRIPTION</h4><blockquote>The<i>cd</i>utility will change the working directory of thecurrent shell execution environment; see<xref href=shexenv><a href="chap2.html#tag_001_012">Shell Execution Environment</a></xref>.&nbsp;If the current working directory is successfully changed, it will save anabsolute pathname of the old working directory in the environment variable<i>OLDPWD</i>and it will save an absolute pathname of the new workingdirectory in the environment variable<i>PWD .</i><p>When invoked with no operands, and the<i>HOME</i>environment variable is set to a non-empty value,the directory named in the<i>HOME</i>environment variable will become the new working directory.If<i>HOME</i>is empty or is undefined, the default behaviour isimplementation-dependent.<p></blockquote><h4><a name = "tag_000_000_308">&nbsp;</a>OPTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_000_309">&nbsp;</a>OPERANDS</h4><blockquote>The following operands are supported:<dl compact><dt><i>directory</i><dd>An absolute or relative pathname of the directory that becomes thenew working directory.The interpretation of a relative pathname by<i>cd</i>depends on the<i>CDPATH</i>environment variable.<dt>-<dd>When a hyphen is used as the operand,this is equivalent to the command: <pre><code>cd "$OLDPWD" &amp;&amp; pwd </code></pre>which changes to the previous working directory and then writes its name.</dl></blockquote><h4><a name = "tag_000_000_310">&nbsp;</a>STDIN</h4><blockquote>Not used.</blockquote><h4><a name = "tag_000_000_311">&nbsp;</a>INPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_000_312">&nbsp;</a>ENVIRONMENT VARIABLES</h4><blockquote>The following environment variables affect the execution of<i>cd</i>:<dl compact><dt><i>CDPATH</i><dd>A colon-separated list of pathnames that refer to directories.If the<i>directory</i>operanddoes not begin with a slash(/)character,and the first component is not dot or dot-dot,<i>cd</i>will search for<i>directory</i>relative to each directory named in the<i>CDPATH</i>variable, in the order listed.The new working directory will be set to the first matching directory found.An empty string in place of a directory pathname represents thecurrent directory.If<i>CDPATH</i>is not set,it will be treated as if it were an empty string.<dt><i>HOME</i><dd>The name of the home directory, used when no<i>directory</i>operand is specified.<dt><i>LANG</i><dd>Provide a default value for the internationalisation variablesthat are unset or null.If<i>LANG</i>is unset or null, the corresponding value from theimplementation-dependent default locale will be used.If any of the internationalisation variables contains an invalid setting, theutility will behave as if none of the variables had been defined.<dt><i>LC_ALL</i><dd>If set to a non-empty string value,override the values of all the other internationalisation variables.<dt><i>LC_CTYPE</i><dd>Determine thelocale for the interpretation of sequences of bytes of text data ascharacters (for example, single- as opposed to multi-byte charactersin arguments).<dt><i>LC_MESSAGES</i><dd>Determine the locale that should be used to affectthe format and contents of diagnosticmessages written to standard error.<dt><i>NLSPATH</i><dd>Determine the location of message cataloguesfor the processing of<i>LC_MESSAGES .</i><dt><i>OLDPWD</i><dd>A pathname of the previous working directory, used by<i>cd</i><b>-</b>.<dt><i>PWD</i><dd>A pathname of the current working directory, set by<i>cd</i>after it has changed to that directory.</dl></blockquote><h4><a name = "tag_000_000_313">&nbsp;</a>ASYNCHRONOUS EVENTS</h4><blockquote>Default.</blockquote><h4><a name = "tag_000_000_314">&nbsp;</a>STDOUT</h4><blockquote>If a non-empty directory name from<i>CDPATH</i>is used,&nbsp;or if<i>cd</i><b>-</b>is used,&nbsp;an absolute pathname of the new working directory will be writtento the standard outputas follows:<p><code><tt>"%s\n"</tt>, &lt;<i>new directory</i>&gt;</code><p>Otherwise,there will be no output.</blockquote><h4><a name = "tag_000_000_315">&nbsp;</a>STDERR</h4><blockquote>Used only for diagnostic messages.</blockquote><h4><a name = "tag_000_000_316">&nbsp;</a>OUTPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_000_317">&nbsp;</a>EXTENDED DESCRIPTION</h4><blockquote>None.</blockquote><h4><a name = "tag_000_000_318">&nbsp;</a>EXIT STATUS</h4><blockquote>The following exit values are returned:<dl compact><dt>0<dd>The directory was successfully changed.<dt>&gt;0<dd>An error occurred.</dl></blockquote><h4><a name = "tag_000_000_319">&nbsp;</a>CONSEQUENCES OF ERRORS</h4><blockquote>The working directory remains unchanged.</blockquote><h4><a name = "tag_000_000_320">&nbsp;</a>APPLICATION USAGE</h4><blockquote>Since<i>cd</i>affects the current shell execution environment,it is always provided as a shell regular built-in.If it is called in a subshell or separate utility execution environment,such as one of the following:<pre><code>(cd /tmp)nohup cdfind . -exec cd {} \;</code></pre>it will not affect the working directory of the caller's environment.<p>The user must have execute (search) permission in<i>directory</i>in order to change to it.</blockquote><h4><a name = "tag_000_000_321">&nbsp;</a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_000_322">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_000_323">&nbsp;</a>SEE ALSO</h4><blockquote><i><a href="pwd.html">pwd</a></i>,the <b>XSH</b> specification description of<i><a href="../xsh/chdir.html">chdir()</a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX &reg; is a registered Trademark of The Open Group.<br>Copyright &copy; 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>
⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -