'\" t .\" Title: unix_chkpwd .\" Author: [see the "AUTHOR" section] .\" Generator: DocBook XSL Stylesheets v1.78.1 .\" Date: 05/18/2017 .\" Manual: Linux-PAM Manual .\" Source: Linux-PAM Manual .\" Language: English .\" .TH "UNIX_CHKPWD" "8" "05/18/2017" "Linux-PAM Manual" "Linux\-PAM Manual" .\" ----------------------------------------------------------------- .\" * Define some portability stuff .\" ----------------------------------------------------------------- .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .\" http://bugs.debian.org/507673 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" ----------------------------------------------------------------- .\" * set default formatting .\" ----------------------------------------------------------------- .\" disable hyphenation .nh .\" disable justification (adjust text to left margin only) .ad l .\" ----------------------------------------------------------------- .\" * MAIN CONTENT STARTS HERE * .\" ----------------------------------------------------------------- .SH "NAME" unix_chkpwd \- Helper binary that verifies the password of the current user .SH "SYNOPSIS" .HP \w'\fBunix_chkpwd\fR\ 'u \fBunix_chkpwd\fR [\&.\&.\&.] .SH "DESCRIPTION" .PP \fIunix_chkpwd\fR is a helper program for the \fIpam_unix\fR module that verifies the password of the current user\&. It also checks password and account expiration dates in \fIshadow\fR\&. It is not intended to be run directly from the command line and logs a security violation if done so\&. .PP It is typically installed setuid root or setgid shadow\&. .PP The interface of the helper \- command line options, and input/output data format are internal to the \fIpam_unix\fR module and it should not be called directly from applications\&. .SH "SEE ALSO" .PP \fBpam_unix\fR(8) .SH "AUTHOR" .PP Written by Andrew Morgan and other various people\&.