Lock/Unlock and Check The User In Linux.

## You can use this command to lock the User: user1.

[root@localhost ~]# passwd -l user1
Locking password for user user1.
passwd: Success

##  This command shows you particular user status. If it is locked or unlock.

[root@localhost ~]# passwd -S user1
user1 PS 2013-01-21 0 99999 7 -1 (Password set, MD5 crypt.)

## Using this command it will give you list.

[root@localhost ~]# cat /etc/passwd | cut -d : -f 1 | awk '{ system("passwd -S " $0) }' 

test PS 2012-12-27 0 99999 7 -1 (Password set, MD5 crypt.)
user1 PS 2013-01-21 0 99999 7 -1 (Password set, MD5 crypt.)
alka LK 2013-01-21 0 99999 7 -1 (Password locked.)
yo LK 2013-01-21 0 99999 7 -1 (Password locked.)

## Using the -u option you can unlock the user.

[root@localhost ~]# passwd -u user1

Unlocking password for user user1.

passwd: Success.

####### Another way to lock/unlock the user is "usermod".

## For Locking user.

[root@localhost ~]#usermod -L username

## for Unlocking the user.

[root@localhost ~]#usermod -U username