Inactive : The number of days after password expires that account is disabled.Warn : The number of days before password is to expire that user is warned that his/her password must be changed.Maximum : The maximum number of days the password is valid, after that user is forced to change her password again.An empty field and value 0 mean that there are no minimum password age. the number of days left before the user is allowed to change her password again. Minimum : The minimum number of days required between password changes i.e.An empty field means that password aging features are disabled.

The value 0 has a special meaning, which is that the user should change her password the next time she will log in the system. Last password change (lastchanged) : The date of the last password change, expressed as the number of days since (Unix time).Usually password format is set to $id$salt$hashed, The $id is the algorithm prefix used On GNU/Linux as follows The password should be minimum 15-20 characters long including special characters, digits, lower case alphabetic and more. Password : Your encrypted password is in hash format.Username : A valid account name, which exist on the system.etc/shadow file format (click to enlarge)Īs with the /etc/passwd, each field in the shadow file is also separated with “:” colon characters as follows:

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