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Setting password expiration information
Earlier, I mentioned that you can set an expiration date on a user's password 
(during our discussion on the 
/etc/shadow
 file). In this section, we'll go through 
how to actually do that. Specifically, the 
chage
 command gives us this ability. We 
can use 
chage
 to alter the expiration period of a user's password, but it's also a more 
convenient way of viewing current expiration information than viewing the 
/etc/
shadow
 file. With the 
-l
 option of 
chage
, along with providing a username, we can see 
the relevant info:
sudo chage -l
Using 
sudo
 or 
root
 is not required to run 
chage
. You're able to 
view expiration information for your own username without 
needing to escalate permissions. However, if you want to view 
information via 
chage
 for any user account other than your own, 
you will need to use 
sudo
.

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Managing Users and Permissions