# man > UNIX_CHKPWD(8)

[UNIX_CHKPWD(8)](https://www.chedong.com/phpMan.php/man/UNIXCHKPWD/8/markdown)                            Linux-PAM Manual                            [UNIX_CHKPWD(8)](https://www.chedong.com/phpMan.php/man/UNIXCHKPWD/8/markdown)



## NAME
       unix_chkpwd - Helper binary that verifies the password of the current user

## SYNOPSIS
       **unix**___**chkpwd** [...]

## DESCRIPTION
       _unix_chkpwd_ is a helper program for the _pam_unix_ module that verifies the password of the
       current user. It also checks password and account expiration dates in _shadow_. It is not
       intended to be run directly from the command line and logs a security violation if done so.

       It is typically installed setuid root or setgid shadow.

       The interface of the helper - command line options, and input/output data format are internal
       to the _pam_unix_ module and it should not be called directly from applications.

## SEE ALSO
       **pam**___**[unix**(8)](https://www.chedong.com/phpMan.php/man/unix/8/markdown)

## AUTHOR
       Written by Andrew Morgan and other various people.



Linux-PAM Manual                             06/08/2020                               [UNIX_CHKPWD(8)](https://www.chedong.com/phpMan.php/man/UNIXCHKPWD/8/markdown)