[Shell] which : 쉘 명령어 및 프로그램의 Path 경로를 확인하는 명령어

cd, ls pwd 와 같은 기본 쉘 명령어 외 프로그램의 경로를 확인하는데 사용하는 명령어.

 

[사용예제]

shell {명령어}

 

-a 옵션을 주면 su 유저권한도 확인할 수 있다.

which -a {명령어}

 

su 유저에 없으면 안나올 수 있다.

 

한줄에 여러 명령어를 확인해 볼 수 있다.

 

[도움말]

Usage: /usr/bin/which [options] [--] COMMAND [...]
Write the full path of COMMAND(s) to standard output.

  --version, -[vV] Print version and exit successfully.
  --help,          Print this help and exit successfully.
  --skip-dot       Skip directories in PATH that start with a dot.
  --skip-tilde     Skip directories in PATH that start with a tilde.
  --show-dot       Don't expand a dot to current directory in output.
  --show-tilde     Output a tilde for HOME directory for non-root.
  --tty-only       Stop processing options on the right if not on tty.
  --all, -a        Print all matches in PATH, not just the first
  --read-alias, -i Read list of aliases from stdin.
  --skip-alias     Ignore option --read-alias; don't read stdin.
  --read-functions Read shell functions from stdin.
  --skip-functions Ignore option --read-functions; don't read stdin.

Recommended use is to write the output of (alias; declare -f) to standard
input, so that which can show aliases and shell functions. See which(1) for
examples.

If the options --read-alias and/or --read-functions are specified then the
output can be a full alias or function definition, optionally followed by
the full path of each command used inside of those.

Report bugs to <which-bugs@gnu.org>.