gl(1) - group listing and group member listing

Version 1.3.1, November 2019

gl [-hV] [-nNpsv0] [GROUP]

Description

gl is a command line tool which lists all members of the speficied user group. If no GROUP (name or numerical id) is given, gl lists all groups.

Options

• -n, --names
  Print the names of groups/group members only.
  This is the default.
• -N, --ids
  Print the numerical IDs of groups/group members only.
  Usually, gl prints only their names.
• -p, --primary
  When listing group members, list primary members only.
  Usually, gl lists primary and secondary members.
• -s, --secondary
  When listing group members, list secondary members only.
  Usually, gl lists primary and secondary members.
• -v, --verbose
  Verbose mode: When listing group members, separate the primary and secondary member list. Also show names and numerical IDs.
• -0, --print0
  Output lines will be separated with NUL instead on linebreaks. Suitable for xargs' --null input option.
• -h, --help
  gl will print a short help summary and exit.
• -V, --version
  gl will print its program version and exit.

Example

• $ gl -v staff
  Lists all members of the staff group.

Installation

To compile gl, just use make:

$ make

To install gl, run 'make install' as the superuser:

# make install

This will copy the binary to /usr/local/bin/gl and the manpage to /usr/local/share/man/man1/gl.1.gz.

Standards and Dependencies

gl is written in C99 (ISO/IEC 9899:1999). It mostly conforms to SUSv3 (POSIX.1-2001), except that it's using GNU libc's getopt_long() function.

Tested with:

• gcc 4.9.1, 7.4.0
• libc6 2.19, 2.27
• GNU Make 4.0, 4.1

See Also

getgrent(3), getgrnam(3)

License

GNU GPL v3

Author

Maximilian Eul <maximilian@eul.cc> (https://github.com/mle86)