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$NetBSD: patch-ab,v 1.2 2005/03/28 20:52:55 agc Exp $

--- digest.1.orig	2005-03-28 21:41:50.000000000 +0100
+++ digest.1	2005-03-28 21:45:50.000000000 +0100
@@ -1,7 +1,7 @@
 .\" $NetBSD: patch-ab,v 1.2 2005/03/28 20:52:55 agc Exp $
 .\"
 .\"
-.\" Copyright (c) 2001 Alistair G. Crooks.  All rights reserved.
+.\" Copyright (c) 2001-2005 Alistair G. Crooks.  All rights reserved.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions
@@ -32,20 +32,28 @@
 .\"
 .\"
 .Dd March 23, 2005
-.Dt DIGEST 1
+.Dt RDIGEST 1
 .Os
 .Sh NAME
-.Nm digest
-.Nd calculate message digests
+.Nm rdigest
+.Nd calculate message digests of files and directories
 .Sh SYNOPSIS
 .Nm
+.Op Fl x Ar directory
 .Ar algorithm
 .Op file ...
 .Sh DESCRIPTION
 The
 .Nm
-utility calculates message digests of files or,
+utility calculates message digests of files, directories, or,
 if no file is specified, standard input.
+The
+.Fl x
+option can be used as many times as required to indicate directories
+not to be included in a directory's hash.
+This allows you to skip, eg, CVS subdirectories in a given tree, which
+can have relatively volatile contents not pertinent to the hash.
+.Pp
 The list of possible algorithms is:
 .Bl -tag -width Ds
 .It md5
@@ -88,12 +96,32 @@
 algorithm implementations, which are located in the standard
 C library, and was designed to be scalable as new message digest
 algorithms are developed.
+The checksum for a directory is implemented as the hash over a list of
+one or two hashes for each of the items in the tree.
+.Bl -bullet
+.It
+For a file, the string
+.Li Dq f \& 
+along with the path make up the data for one hash, and the contents of
+the file is used for the second hash.
+.It
+For a symbolic link, the string
+.Li Dq l \&
+along with the path to the symbolic link make up the data for one
+hash, and the target of the symbolic link is used for the second hash.
+.It
+For a directory, the string
+.Li Dq d \&
+along with the path make up the data for one hash.
+There is no second hash for a directory.
+.El
 .Pp
 The
 .Nm
 utility exits 0 on success, and \*[Gt]0 if an error occurs.
 .Sh SEE ALSO
 .Xr cksum 1 ,
+.Xr digest 1 ,
 .Xr md5 3 ,
 .Xr rmd160 3 ,
 .Xr sha1 3
@@ -101,9 +129,13 @@
 The
 .Nm
 utility first appeared in
-.Nx 1.6 .
+.Nx 2.0 .
 .Sh AUTHORS
 The
+.Xr digest 1
+utility was written by Alistair G. Crooks \*[Lt]agc@netbsd.org\*[Gt].
 .Nm
-utility was written by
-.An Alistair G. Crooks Aq agc@netbsd.org .
+was implemented by Andrew Brown \*[Lt]atatat@netbsd.org\*[Gt] as a
+patch to
+.Xr digest 1
+to add recursive capabilities.