parse groups

parse-groups.py

#!/usr/bin/env python

with open('/etc/group') as f:
    groups = f.readlines()

mygroups = {}

for ll in groups:
    ll = ll.split(':') 
    if len(ll[3]) > 1:
       groupname, groupmembers = ll[0], ll[3].strip()
       if groupname != groupmembers:
          mygroups[groupname] = [ x for x in groupmembers.split(',') ]

for key,values in mygroups.items():
    print "groupadd {}".format(key)
    for v in values:
        print "usermod -aG {} {}".format(key,v)