Is there a command to list all Unix group names?

Question

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.

Answer 1

# list every group name, one per line

getent group | cut -d: -f1

You can also read the group file in the etc directory, but that file only has local groups. If the machine is joined to AD or LDAP through SSSD, those groups won't be in there. getent goes through the system's name service, so you get both.

# groups for a single user

id username

# who is in wheel (usually how I check sudo access on RHEL)

getent group wheel