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+'\" t
+.\"     Title: pwconv
+.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
+.\" Generator: DocBook XSL Stylesheets v1.75.2 <http://docbook.sf.net/>
+.\"      Date: 02/12/2012
+.\"    Manual: System Management Commands
+.\"    Source: shadow-utils 4.1.5
+.\"  Language: English
+.\"
+.TH "PWCONV" "8" "02/12/2012" "shadow\-utils 4\&.1\&.5" "System Management Commands"
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "NAME"
+pwconv, pwunconv, grpconv, grpunconv \- convert to and from shadow passwords and groups
+.SH "SYNOPSIS"
+.HP \w'\fBpwconv\fR\ 'u
+\fBpwconv\fR [\fIoptions\fR]
+.HP \w'\fBpwunconv\fR\ 'u
+\fBpwunconv\fR [\fIoptions\fR]
+.HP \w'\fBgrpconv\fR\ 'u
+\fBgrpconv\fR [\fIoptions\fR]
+.HP \w'\fBgrpunconv\fR\ 'u
+\fBgrpunconv\fR [\fIoptions\fR]
+.SH "DESCRIPTION"
+.PP
+The
+\fBpwconv\fR
+command creates
+\fIshadow\fR
+from
+\fIpasswd\fR
+and an optionally existing
+\fIshadow\fR\&.
+.PP
+The
+\fBpwunconv\fR
+command creates
+\fIpasswd\fR
+from
+\fIpasswd\fR
+and
+\fIshadow\fR
+and then removes
+\fIshadow\fR\&.
+.PP
+The
+\fBgrpconv\fR
+command creates
+\fIgshadow\fR
+from
+\fIgroup\fR
+and an optionally existing
+\fIgshadow\fR\&.
+.PP
+The
+\fBgrpunconv\fR
+command creates
+\fIgroup\fR
+from
+\fIgroup\fR
+and
+\fIgshadow\fR
+and then removes
+\fIgshadow\fR\&.
+.PP
+These four programs all operate on the normal and shadow password and group files:
+/etc/passwd,
+/etc/group,
+/etc/shadow, and
+/etc/gshadow\&.
+.PP
+Each program acquires the necessary locks before conversion\&.
+\fBpwconv\fR
+and
+\fBgrpconv\fR
+are similar\&. First, entries in the shadowed file which don\*(Aqt exist in the main file are removed\&. Then, shadowed entries which don\*(Aqt have `x\*(Aq as the password in the main file are updated\&. Any missing shadowed entries are added\&. Finally, passwords in the main file are replaced with `x\*(Aq\&. These programs can be used for initial conversion as well to update the shadowed file if the main file is edited by hand\&.
+.PP
+
+\fBpwconv\fR
+will use the values of
+\fIPASS_MIN_DAYS\fR,
+\fIPASS_MAX_DAYS\fR, and
+\fIPASS_WARN_AGE\fR
+from
+/etc/login\&.defs
+when adding new entries to
+/etc/shadow\&.
+.PP
+Likewise
+\fBpwunconv\fR
+and
+\fBgrpunconv\fR
+are similar\&. Passwords in the main file are updated from the shadowed file\&. Entries which exist in the main file but not in the shadowed file are left alone\&. Finally, the shadowed file is removed\&. Some password aging information is lost by
+\fBpwunconv\fR\&. It will convert what it can\&.
+.SH "OPTIONS"
+.PP
+The options which apply to the
+\fBpwconv\fR,
+\fBpwunconv\fR,
+\fBgrpconv\fR, and
+\fBgrpunconv\fR
+commands 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
+.SH "BUGS"
+.PP
+Errors in the password or group files (such as invalid or duplicate entries) may cause these programs to loop forever or fail in other strange ways\&. Please run
+\fBpwck\fR
+and
+\fBgrpck\fR
+to correct any such errors before converting to or from shadow passwords or groups\&.
+.SH "CONFIGURATION"
+.PP
+The following configuration variable in
+/etc/login\&.defs
+changes the behavior of
+\fBgrpconv\fR
+and
+\fBgrpunconv\fR:
+.PP
+\fBMAX_MEMBERS_PER_GROUP\fR (number)
+.RS 4
+Maximum members per group entry\&. When the maximum is reached, a new group entry (line) is started in
+/etc/group
+(with the same name, same password, and same GID)\&.
+.sp
+The default value is 0, meaning that there are no limits in the number of members in a group\&.
+.sp
+This feature (split group) permits to limit the length of lines in the group file\&. This is useful to make sure that lines for NIS groups are not larger than 1024 characters\&.
+.sp
+If you need to enforce such limit, you can use 25\&.
+.sp
+Note: split groups may not be supported by all tools (even in the Shadow toolsuite)\&. You should not use this variable unless you really need it\&.
+.RE
+.PP
+The following configuration variables in
+/etc/login\&.defs
+change the behavior of
+\fBpwconv\fR:
+.PP
+\fBPASS_MAX_DAYS\fR (number)
+.RS 4
+The maximum number of days a password may be used\&. If the password is older than this, a password change will be forced\&. If not specified, \-1 will be assumed (which disables the restriction)\&.
+.RE
+.PP
+\fBPASS_MIN_DAYS\fR (number)
+.RS 4
+The minimum number of days allowed between password changes\&. Any password changes attempted sooner than this will be rejected\&. If not specified, \-1 will be assumed (which disables the restriction)\&.
+.RE
+.PP
+\fBPASS_WARN_AGE\fR (number)
+.RS 4
+The number of days warning given before a password expires\&. A zero means warning is given only upon the day of expiration, a negative value means no warning is given\&. If not specified, no warning will be provided\&.
+.RE
+.SH "FILES"
+.PP
+/etc/login\&.defs
+.RS 4
+Shadow password suite configuration\&.
+.RE
+.SH "SEE ALSO"
+.PP
+
+\fBgrpck\fR(8),
+\fBlogin.defs\fR(5),
+\fBpwck\fR(8)\&.