Force password change at next login

passwd -e username


Show user password expiration

chage -l username

Example:

linux:~ # chage -l toshiro
Minimum: 0
Maximum: 99999
Warning: 7
Inactive: -1
Last Change: May 10, 2011
Password Expires: Never
Password Inactive: Never
Account Expires: Never

Note:

Only root can see other user's expiration values, each user can see their own data