force to change password(by modifying /etc/shadow)

Shell Programming and Scripting
1

hi
by modifying /etc/shadow
how can I Force a change of password so that user has at least 1 week to login?

I did it by using:

echo "enter username to force password change"  
read user;
chage -M 7 $user;

How can I do it by modifying /etc/shadow??

2

I'd say compare your /etc/shadow before you use "chage" and after. But why do you want to do that by modifying your /etc/shadow instead of using "chage"?

3

cos,chage command is not workin...

4

???????

5

???????

6

It's not allowed to bump up questions! Please read the rules.

7

ok....