readlink

readlink -f .

显示你当前在那一个目录下。

-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