Linux中的cd命令

cd==change directory==切换目录

Linux中用cd命令来切换路径

cd命令的语法

cd的语法，可参见：

CLi@PC-CLI-1 ~/develop/docbook
$ help cd
cd: cd [-L|-P] [dir]
    Change the shell working directory.

    Change the current directory to DIR.  The default DIR is the value of the
    HOME shell variable.

    The variable CDPATH defines the search path for the directory containing
    DIR.  Alternative directory names in CDPATH are separated by a colon (:).
    A null directory name is the same as the current directory.  If DIR begins
    with a slash (/), then CDPATH is not used.

    If the directory is not found, and the shell option `cdable_vars' is set,
    the word is assumed to be  a variable name.  If that variable has a value,
    its value is used for DIR.

    Options:
        -L      force symbolic links to be followed
        -P      use the physical directory structure without following symbolic
        links

    The default is to follow symbolic links, as if `-L' were specified.

    Exit Status:
    Returns 0 if the directory is changed; non-zero otherwise.

从其解释中，我们可以知道：

如果没有给cd参数的话，默认就是使用HOME环境变量当参数

即：

如果没有给cd参数的话，则等价于：

cd $HOME

而由于：

【整理】Linux系统中用波浪号~表示用户的根目录即$HOME，以及为何用波浪号表示用户根目录

所以：

假设当前用户是：CLi

那么又等价于：cd /home/CLi

即：

cd加上减号表示切换到前一次的路径/目录

cd，加上减号’-‘作为参数的话，表示：

切换到上一次，前一次，所在的目录。

举例：

CLi@PC-CLI-1 ~/develop/docbook
$ pwd
/home/CLi/develop/docbook

CLi@PC-CLI-1 ~/develop/docbook
$ cd tools/

CLi@PC-CLI-1 ~/develop/docbook/tools
$ pwd
/home/CLi/develop/docbook/tools

CLi@PC-CLI-1 ~/develop/docbook/tools
$ cd -
/home/CLi/develop/docbook

如图：

总结

cd命令，用好了，也可以提高工作效率。

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