Where Is Password Policy in Linux?

How do I find my password policy in Linux?

By default, all Linux operating systems requires password length of minimum 6 characters for the users.
…
We are going to set the following policies.

1. Maximum number of days a password may be used.
2. Minimum number of days allowed between password changes.
3. Number of days warning given before a password expires.

How do I change a password parameter in Linux?

To change a password on behalf of a user:

1. First sign on or “su” or “sudo” to the “root” account on Linux, run: sudo -i.
2. Then type, passwd tom to change a password for tom user.
3. The system will prompt you to enter a password twice.