shadow/man/chpasswd.8

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.\" Copyright 1991, Julianne Frances Haugh
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.\" 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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.\" $Id: chpasswd.8,v 1.6 2000/08/26 18:27:17 marekm Exp $
.\"
.TH CHPASSWD 8
.SH NAME
\fBchpasswd\fR - update password file in batch
.SH SYNOPSIS
\fBchpasswd [-e]\fR
.SH DESCRIPTION
\fBchpasswd\fR reads a file of user name and password pairs
from standard input and uses this information
to update a group of existing users. Without the -e switch, the
passwords are expected to be cleartext. With the -e switch, the
passwords are expected to be in encrypted form.
Each line is of the format
.sp 1
\fIuser_name\fR:\fIpassword\fR
.sp 1
The named user must exist.
The supplied password will be encrypted as necessary, and the password age
updated, if present.
.PP
This command is intended to be used in a large system environment where
many accounts are created at a single time.
.SH CAVEATS
.\" The \fBmkpasswd\fR command must be executed afterwards to update the
.\" DBM password files.
The input file must be protected if it contains unencrypted passwords.
.\" This command may be discarded in favor of the newusers(8) command.
.SH SEE ALSO
.\" mkpasswd(8), passwd(1), useradd(1)
.BR passwd (1),
.BR useradd (8),
.BR newusers (8)
.SH AUTHOR
Julianne Frances Haugh (jfh@austin.ibm.com)