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I have 20 computers in a high school lab and I want to set up a standard student log in. This is done, the problem is that students can change the password to anything, is there a way to block this? thanks.

Vincent
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  • Can you be more explicit. About what password do you speak? "password to anything" doesn't sound clear for me. – Radu Rădeanu Jun 03 '13 at 18:09
  • @RaduRădeanu Vincent is saying users can change the password to any arbitrary password, thus other students can not log in. A sort of DOS. – Panther Jun 03 '13 at 18:16

1 Answers1

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Use the -n option

-n, --mindays MIN_DAYS

Set the minimum number of days between password changes to MIN_DAYS. A value of zero for this field indicates that the user may change his/her password at any time.

So 

sudo passwd <user> -n 10000

See http://manpages.ubuntu.com/manpages/quantal/man1/passwd.1.html

Radu Rădeanu
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Panther
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