Linux 查看某个用户组的所有用户（Python实现）

#encoding: utf-8
#author: walker
#date: 2017-07-31
#summary: Linux 查看某个用户组的所有用户
#filename: group_users.py

import sys

#打印某个组的所有成员
def ShowGroupUsers(group_name):
group_id = 'err'
users = ''
with open('/etc/group') as f:
for line in f:
line = line.strip()
vec = line.split(':')
if vec[0] == group_name:
group_id = vec[2]
users = vec[3]
if group_id == 'err':
print('not find %s in /etc/group')
return False

with open('/etc/passwd') as f:
for line in f:
line = line.strip()
vec = line.split(':')
if vec[3] == group_id:
users += ',' + vec[0]

user_set = set(filter(lambda x:x, users.split(',')))
users = ','.join(sorted(list(user_set)))
print('%s(%s) users: %s' % (group_name, group_id, users))

return True

if __name__ == '__main__':
ShowGroupUsers(sys.argv[1])

python group_users.py groupX