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+'\" t
+.\"     Title: chsh
+.\"    Author: Julianne Frances Haugh
+.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
+.\"      Date: 01/23/2020
+.\"    Manual: User Commands
+.\"    Source: shadow-utils 4.8.1
+.\"  Language: English
+.\"
+.TH "CHSH" "1" "01/23/2020" "shadow\-utils 4\&.8\&.1" "User Commands"
+.\" -----------------------------------------------------------------
+.\" * 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"
+chsh \- change login shell
+.SH "SYNOPSIS"
+.HP \w'\fBchsh\fR\ 'u
+\fBchsh\fR [\fIoptions\fR] [\fILOGIN\fR]
+.SH "DESCRIPTION"
+.PP
+The
+\fBchsh\fR
+command changes the user login shell\&. This determines the name of the user\*(Aqs initial login command\&. A normal user may only change the login shell for her own account; the superuser may change the login shell for any account\&.
+.SH "OPTIONS"
+.PP
+The options which apply to the
+\fBchsh\fR
+command are:
+.PP
+\fB\-h\fR, \fB\-\-help\fR
+.RS 4
+Display help message and exit\&.
+.RE
+.PP
+\fB\-R\fR, \fB\-\-root\fR\ \&\fICHROOT_DIR\fR
+.RS 4
+Apply changes in the
+\fICHROOT_DIR\fR
+directory and use the configuration files from the
+\fICHROOT_DIR\fR
+directory\&.
+.RE
+.PP
+\fB\-s\fR, \fB\-\-shell\fR\ \&\fISHELL\fR
+.RS 4
+The name of the user\*(Aqs new login shell\&. Setting this field to blank causes the system to select the default login shell\&.
+.RE
+.PP
+If the
+\fB\-s\fR
+option is not selected,
+\fBchsh\fR
+operates in an interactive fashion, prompting the user with the current login shell\&. Enter the new value to change the shell, or leave the line blank to use the current one\&. The current shell is displayed between a pair of
+\fI[ ]\fR
+marks\&.
+.SH "NOTE"
+.PP
+The only restriction placed on the login shell is that the command name must be listed in
+/etc/shells, unless the invoker is the superuser, and then any value may be added\&. An account with a restricted login shell may not change her login shell\&. For this reason, placing
+/bin/rsh
+in
+/etc/shells
+is discouraged since accidentally changing to a restricted shell would prevent the user from ever changing her login shell back to its original value\&.
+.SH "CONFIGURATION"
+.PP
+The following configuration variables in
+/etc/login\&.defs
+change the behavior of this tool:
+.PP
+\fBCHSH_AUTH\fR (boolean)
+.RS 4
+If
+\fIyes\fR, the
+\fBchsh\fR
+program will require authentication before making any changes, unless run by the superuser\&.
+.RE
+.PP
+\fBLOGIN_STRING\fR (string)
+.RS 4
+The string used for prompting a password\&. The default is to use "Password: ", or a translation of that string\&. If you set this variable, the prompt will not be translated\&.
+.sp
+If the string contains
+\fI%s\fR, this will be replaced by the user\*(Aqs name\&.
+.RE
+.SH "FILES"
+.PP
+/etc/passwd
+.RS 4
+User account information\&.
+.RE
+.PP
+/etc/shells
+.RS 4
+List of valid login shells\&.
+.RE
+.PP
+/etc/login\&.defs
+.RS 4
+Shadow password suite configuration\&.
+.RE
+.SH "SEE ALSO"
+.PP
+\fBchfn\fR(1),
+\fBlogin.defs\fR(5),
+\fBpasswd\fR(5)\&.