I need to set up an account inactivity expiration date (es. 1 year).
As shown in some tutorials, a way of doing so is to use the usermod command.
Due to some constraints, I need to do so offline, modifying some configuration file before running my embedded (poky) distro.
What changes in which configuration file should I apply to have the same effects of such usermod command?
this is set in 8th field in /etc/shadow (see man 5 shadow).
account expiration date
The date of expiration of the account, expressed as the number of days since Jan 1, 1970 00:00 UTC.
Note that an account expiration differs from a password expiration. In case of an account expiration, the user shall not be allowed to login. In case of a password expiration, the user is not allowed to login using her password.
An empty field means that the account will never expire.
You can compute expiration date using expr $(date +%s ) / 86400 which will give you number of days since 1/1/1970, then adding whatever days you want.
Note that this will disable user loging after expiration date (as explained above), but will not kill/disable any running unix process.
