linux - bash: change my own password (without using root) -

normally chpasswd great job @ setting users password.

is there way non-privileged user may change own password?

i interested in writing gtk front end this, best if requires users old password well.

---

change $user password?        old password [         ]        new password [         ] new password again [         ]  [cancel]               [apply] 

---

looking for

$command $enter:oldpass $enter:newpass password updated 

of course there is, here tutorial of password in linux

and solution is

task: set or change user password  type passwd command follows change own password: $ passwd output:  changing password vivek (current) unix password: enter new unix password: retype new unix password: passwd: password updated  user first prompted his/her old password, if 1 present. password encrypted , compared against stored password. user has 1 chance enter correct password. super user permitted bypass step forgotten passwords may changed.  new password tested complexity. general guideline, passwords should consist of 6 8 characters including 1 or more each of following sets:      lower case alphabetics     upper case alphabetics     digits 0 thru 9     punctuation marks