password aging on non-trusted systems

At the end of the encrypted password you add char1, char2.
char1 is the maximum number of weeks the password is valid and
char2 is the minimum number of weeks that must pass before the password can be changed. The following is a good guide: Value # of weeks
. 0
/ 1
0-9 2-11
A-Z 12-37
a-z 38-63
so for example if you wanted a user to change their password somewhere between 11 and 2 weeks you would put ,A9. (man 4 passwd)

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