how to change password.

[vishwanath kalbagilmath <vishwanath_kc@xxxxxxxxx>]

hi friends,
   I am developing a module called password manager,
in which i will be managing the password issue in
whole the system.
I get a username oldpassword and new password through
mails and i should update them at the OS level i mean
in /etc/passwd and also in /etc/shadow files.

so how should i do it ? I have a raw sloution(using
dup with passwd command) but i want the right one.
plz do help.

thanx in advance
cheers
vishwanath

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