Section (1) groups
groups — print the groups a user is in
Print group memberships for each USERNAME or, if no USERNAME is specified, for the current process (which may differ if the groups database has changed).
display this help and exit
output version information and exit
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
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Full documentation <https://www.gnu.org/software/coreutils/groups>
or available locally via: info _zsingle_quotesz_(coreutils) groups invocation_zsingle_quotesz_
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