How does new password is assigned to a normal user in unix?

Hi,

As all users passwords are stored in encrypted form in
/etc/password file, how could i able to change my password
through my user login, even though i dont have write permission on /etc/password file? Internally how kernel
is editing password file.

regards
dssr
dssrrjyAsked:
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tfewsterCommented:
/usr/bin/passwd is a SUID program, i.e. it runs with superuser permissions. It checks which user is executing it, and only allows them to modify their own entry.
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