How To Find The Users With Empty Password

/etc/shadow is the file which we look for password information.

/etc/shadow content:
===============

scott:!!:16236:0:99999:7:::
peter:!!:16236:0:99999:7:::
kevin:!!:16236:0:99999:7:::

This is actual content for a default user/new user.

[root@node1 /]# passwd -d scott
Removing password for user scott.
passwd: Success
[root@node1 /]# passwd -d peter
Removing password for user peter.
passwd: Success
[root@node1 /]# passwd -d kevin
Removing password for user kevin.
passwd: Success

scott::16236:0:99999:7:::
peter::16236:0:99999:7:::
kevin::16236:0:99999:7:::

The above is the content after remving the password for the user using the command # passwd -d

[root@node1 /]# cat /etc/shadow | awk -F: '($2==""){print $1}'
scott
peter
kevin
[root@node1 /]#

Now the above script will give the list of users with EMPTY PASSWORD.