# Bash 的 printenv 命令

printenv [OPTION]... [VARIABLE]...

$ printenv SHELL
/bin/bash
$ printenv USER
primers
$ printenv TERM
xterm

PRINTENV(1)                      User Commands                     PRINTENV(1)

NAME
       printenv - print all or part of environment

SYNOPSIS
       printenv [OPTION]... [VARIABLE]...

DESCRIPTION
       Print the values of the specified environment VARIABLE(s).  If no VARI‐
       ABLE is specified, print name and value pairs for them all.

       -0, --null
              end each output line with NUL, not newline

       --help display this help and exit

       --version
              output version information and exit

       NOTE:  your  shell  may have its own version of printenv, which usually
       supersedes the version described here.  Please refer  to  your  shell's
       documentation for details about the options it supports.

AUTHOR
       Written by David MacKenzie and Richard Mlynarik.

REPORTING BUGS
       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
       Report any translation bugs to <https://translationproject.org/team/>

COPYRIGHT
       Copyright  ©  2023  Free Software Foundation, Inc.  License GPLv3+: GNU
       GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
       This is free software: you are free  to  change  and  redistribute  it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       Full documentation <https://www.gnu.org/software/coreutils/printenv>
       or available locally via: info '(coreutils) printenv invocation'

GNU coreutils 9.4                 April 2024                       PRINTENV(1)