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The external groups command displays the groups to which you or a user belongs. All users belong to a group. The fourth colon-separated field of the /etc/passwd file defines the primary group to which you belong. You may also belong to other groups by being listed beside a group in the /etc/group file. You have group permissions for files or directories owned by one of the groups to which you are a member.The groups command is used to display all of the groups to which you belong. You may find it helpful to belong to several groups so you have certain access permissions for various directories and files.
Following is the general format of the groups command.
groups [ user ... ]
Arguments
The following argument may be passed to the groups command.
| user | You can specify a list of users whom you want to know to which groups they belong. |
The groups command reads your user name and group ID from the /etc/passwd file, then searches the /etc/group file for any additional groups to which you belong.
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Last modified: February 28, 2008