working with Linux Users and Groups

show_linux_users_and_groups.sh

# List users and their groups:

	for user in $(awk -F: '{print $1}' /etc/passwd); do groups $user; done


# List groups and their users:

	cat /etc/group | awk -F: '{print $1, $3, $4}' | while read group gid members; do
	    members=$members,$(awk -F: "\$4 == $gid {print \",\" \$1}" /etc/passwd);
	    echo "$group: $members" | sed 's/,,*/ /g';
	done


# ref : https://serverfault.com/questions/355292/show-all-users-and-their-groups-vice-versa