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I know there is the /etc/group file that lists all users groups.
I would like to know if there is a simple command to list all user group names in spite of parsing the world readable /etc/group file. I am willing to create an administrator web page that lists Linux accounts' group names.
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List All Groups. To view all groups present on the system simply open the /etc/group file. Each line in this file represents information for one group. Another option is to use the getent command which displays entries from databases configured in /etc/nsswitch.
Use the most commonly used “cat” command to get the list of the groups available in the “/etc/group” file. When you run the command, you will get the list of the groups.
In order to list groups on Linux, you have to execute the “cat” command on the “/etc/group” file. When executing this command, you will be presented with the list of groups available on your system.
Description. The lsgroup command displays group attributes. You can use this command to list all the system groups and their attributes or you can list all the attributes of individual groups. Since there is no default parameter, you must enter the ALL keyword to list all the system groups and their attributes.
To list all local groups which have users assigned to them, use this command:
cut -d: -f1 /etc/group | sort For more info- > Unix groups, Cut command, sort command
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