User password expiration

On Linux it is important to control the users passwords expiration. The password expiration information is stored in /etc/shadow.
Inspect the password expiration from one user:

# chage -l testuser

Last password change                                  : Aug 21, 2014

Password expires                                        :  Sep 21, 2014
Password inactive                                       : never
Account expires                                         : never
Minimum number of days between password change          : 0
Maximum number of days between password change          : 30
Number of days of warning before password expires       : 7
Inspect the password expiration from all the users(Script):

for i in `cat /etc/passwd | awk -F: '{print $1}'`; do echo "UserName:${i}"; chage -l $i|grep "Password Expires" ;done

Disable the password expiration from one user:

# chage -I -1 -m 0 -M 99999 -E -1 testuser