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-rw-r--r--man/do-diffs.114
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diff --git a/man/do-diffs.1 b/man/do-diffs.1
index cb42bb5..6202227 100644
--- a/man/do-diffs.1
+++ b/man/do-diffs.1
@@ -5,6 +5,9 @@
do-diffs \- run rancid for each of the groups
.SH SYNOPSIS
.B do-diffs
+[\c
+.BI \-r\ \c
+device_name]\ \c
[group [group ...]]
.SH DESCRIPTION
.B do-diffs
@@ -53,6 +56,16 @@ For example:
.fi
.in -1i
.\"
+.PP
+.\"
+The command-line options are as follows:
+.TP
+.B \-r device_name
+Specify the name, as it appears in a group's router.db, of a particular
+device to collect and generate diffs for. The device must be marked "up".
+If a group is not specified on the command-line, rancid will be run
+against any group in which the device_name appears.
+.\"
.SH ENVIRONMENT
.B do-diffs
utilizes the following environment variables from
@@ -92,4 +105,5 @@ configuration file.
.El
.SH SEE ALSO
.BR control_rancid (1),
+.BR router.db (5),
.BR env (5)