A user is given, and the password warning period is obtained. Then, the user's password validity period is determined to be earlier than the warning period.

If a user is given, the password warning period is obtained, and then the user's password validity period is determined to be earlier than the warning period;

Tip: calculation method. The maximum validity period minus the number of days in use is the remaining validity period;

If the value is smaller than, "warning" is displayed; otherwise, "OK" is displayed ".

 

#! /Bin/bash

W = 'grep "student"/etc/shadow | cut-D:-F6'

S = 'date + % s'

T = 'expr $ S/8080'

L = 'grep "^ student"/etc/shadow | cut-D:-f5'

N = 'grep "^ student"/etc/shadow | cut-D:-F3'

Sy = $ [$ L-$ [$ T-$ N]

 

If [$ sy-lt $ w]; then

Echo 'warning'

Else

Echo 'OK'

Fi

A user is given, and the password warning period is obtained. Then, the user's password validity period is determined to be earlier than the warning period.