linux readlink命令

桃扇骨 2021-09-27 14:34 117阅读 0赞

readlink是linux系统中一个常用工具，主要用来找出符号链接所指向的位置.

$ readlink --help //或者man readlink
    
    Usage: readlink [OPTION]... FILE
    Print value of a symbolic link or canonical file name //输出符号链接值或者权威文件名
    
      -f, --canonicalize            canonicalize by following every symlink in
                                    every component of the given name recursively;
                                    all but the last component must exist
      -e, --canonicalize-existing   canonicalize by following every symlink in
                                    every component of the given name recursively,
                                    all components must exist
      -m, --canonicalize-missing    canonicalize by following every symlink in
                                    every component of the given name recursively,
                                    without requirements on components existence
      -n, --no-newline              do not output the trailing newline
      -q, --quiet,
      -s, --silent                  suppress most error messages
      -v, --verbose                 report error messages
          --help     display this help and exit
          --version  output version information and exit
    
    Report readlink bugs to bug-coreutils@gnu.org
    GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
    General help using GNU software: <http://www.gnu.org/gethelp/>
    For complete documentation, run: info coreutils 'readlink invocation'

实例

$ readlink /usr/bin/awk
    ../../bin/gawk    //真正的可执行文件

**-f **选项：

\-f 选项可以递归跟随给出文件名的所有符号链接以标准化，除最后一个外所有组件必须存在。

简单地说，就是一直跟随符号链接，直到直到非符号链接的文件位置，限制是最后必须存在一个非符号链接的文件。

$ readlink -f /usr/bin/awk
    /bin/gawk

参考：[readlink命令][readlink]

[readlink]: https://blog.csdn.net/diabloneo/article/details/7173438