## You can use this command to lock the User: shrii.
[root@localhost ~]# passwd -l shrii
Locking password for user shrii.
passwd: Success
## This command shows you particular user status. If it is locked or unlock.
[root@localhost ~]# passwd -S shrii
shrii 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.)
shrii PS 2013-01-21 0 99999 7 -1 (Password set, MD5 crypt.)
shrikant 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 shrii
Unlocking password for user shrii.
passwd: Success.
####### Another way to lock/unlock the user is "usermod".
## For Locking user.
usermod -L username
## for Unlocking the user.
usermod -U username
