GNU/Linux account expiration date

Please demonstrate 10 examples of setting an expiration date on a GNU/Linux user's account.

Setting an expiration date on a GNU/Linux user's account can be achieved by modifying the account's attributes using the usermod command or by directly editing the /etc/passwd file. Here are ten examples of how to set an expiration date for a user's account:

1. Using usermod command to set an expiration date:

2. Setting an expiration date in seconds since the epoch (Unix timestamp) using usermod:

3. Setting an expiration date using the chage command:

4. Setting an expiration date in the YYYY-MM-DD format directly in the /etc/passwd file:

Edit the user's entry and change the last field to the desired expiration date, e.g.:

5. Setting an expiration date using the passwd command (requires user interaction):

The user will be prompted to change their password upon next login.

6. Setting an expiration date in seconds since the epoch (Unix timestamp) directly in /etc/passwd:

Edit the user's entry and change the last field to the desired expiration date in seconds since the epoch, e.g.:

7. Setting an expiration date using the useradd command (when creating a new user):

8. Setting an expiration date using the chpasswd command:

9. Setting an expiration date using the pam_tally2 command:

This example sets an expiration date for 30 days of inactivity.

10. Setting an expiration date using the userdel command (to delete the account on a specific date):

Remember to replace username with the actual username you want to set the expiration date for, and adjust the desired expiration date according to your needs.