Usage: /usr/bin/printenv [OPTION] [VARIABLE]...
Print the values of the specified environment VARIABLE(s).
If no VARIABLE 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

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.

Report bugs to: <bug-coreutils@gnu.org>.
GNU coreutils home page: <https://www.gnu.org/software/coreutils/>
General help using GNU software: <https://www.gnu.org/gethelp/>
Full documentation <https://www.gnu.org/software/coreutils/printenv>
or available locally via: info '(coreutils) printenv invocation'