Octave’s group database functions return information in a structure with the following fields.
nameThe user name.
passwdThe encrypted password, if available.
gidThe numeric group id.
memThe members of the group.
In the descriptions of the following functions, this data structure is referred to as a grp_struct.
Return an entry from the group database, opening it if necessary.
Once the end of data has been reached, getgrent returns 0.
Return the first entry from the group database with the group ID gid.
If the group ID does not exist in the database, getgrgid returns 0.
See also: getgrnam.
Return the first entry from the group database with the group name name.
If the group name does not exist in the database, getgrnam returns 0.
See also: getgrgid.
Return the internal pointer to the beginning of the group database.
© 1996–2018 John W. Eaton
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https://octave.org/doc/interpreter/Group-Database-Functions.html