How to Change password expiry in Linux

chage command is used to list & change the password aging information on Linux environments

To listing password aging for user

               # chage -l user

• To change the number of days to expire

               # chage -M 100 existing_user

• To set expiration warning days

               # chage -W 20 existing_user

• To Change the password to never expire

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