Here’s a quick one. If you have a server and you do not want the password for a user to expire (as it can screw some things up while its active), you need to execute the following commands as
passwd -x -1
where is the username whose password expiry you wish to remove. For instance, in my case, if username is dm014, I executed:
passwd -x -1 dm014
I have tested this and it works flawlessly on most Linux and Solaris operating systems.