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diff --git a/usr.bin/diff/diff.1 b/usr.bin/diff/diff.1
--- a/usr.bin/diff/diff.1
+++ b/usr.bin/diff/diff.1
@@ -30,7 +30,7 @@
.\" @(#)diff.1 8.1 (Berkeley) 6/30/93
.\" $FreeBSD$
.\"
-.Dd June 19, 2020
+.Dd March 10, 2022
.Dt DIFF 1
.Os
.Sh NAME
@@ -207,6 +207,9 @@
.Op Fl -width
.Fl y | Fl -side-by-side
.Ar file1 file2
+.Nm diff
+.Op Fl -help
+.Op Fl -version
.Sh DESCRIPTION
The
.Nm
@@ -282,6 +285,8 @@
flag, but in reverse order.
It cannot be digested by
.Xr ed 1 .
+.It Fl -help
+This option prints a summary to stdout and exits with status 0.
.It Fl n
Produces a script similar to that of
.Fl e ,
@@ -308,6 +313,8 @@
.Fl c ,
all lines to be changed (added and/or removed) are present in
a single section.
+.It Fl -version
+This option prints a version string to stdout and exits with status 0.
.It Fl y Fl -side-by-side
Output in two columns with a marker between them.
The marker can be one
@@ -655,6 +662,12 @@
.It >1
An error occurred.
.El
+.Pp
+The
+.Fl -help
+and
+.Fl -version
+options exit with a status of 0.
.Sh EXAMPLES
Compare
.Pa old_dir
diff --git a/usr.bin/diff/diff.c b/usr.bin/diff/diff.c
--- a/usr.bin/diff/diff.c
+++ b/usr.bin/diff/diff.c
@@ -38,8 +38,10 @@
#include "diff.h"
#include "xmalloc.h"
+static const char diff_version[] = "FreeBSD diff 20220309";
bool lflag, Nflag, Pflag, rflag, sflag, Tflag, cflag;
bool ignore_file_case, suppress_common, color, noderef;
+static bool help = false;
int diff_format, diff_context, status;
int tabsize = 8, width = 130;
static int colorflag = COLORFLAG_NEVER;
@@ -58,11 +60,13 @@
OPT_IGN_FN_CASE,
OPT_NO_IGN_FN_CASE,
OPT_NORMAL,
+ OPT_HELP,
OPT_HORIZON_LINES,
OPT_CHANGED_GROUP_FORMAT,
OPT_SUPPRESS_COMMON,
OPT_COLOR,
OPT_NO_DEREFERENCE,
+ OPT_VERSION,
};
static struct option longopts[] = {
@@ -97,6 +101,7 @@
{ "exclude-from", required_argument, 0, 'X' },
{ "side-by-side", no_argument, NULL, 'y' },
{ "ignore-file-name-case", no_argument, NULL, OPT_IGN_FN_CASE },
+ { "help", no_argument, NULL, OPT_HELP},
{ "horizon-lines", required_argument, NULL, OPT_HORIZON_LINES },
{ "no-dereference", no_argument, NULL, OPT_NO_DEREFERENCE},
{ "no-ignore-file-name-case", no_argument, NULL, OPT_NO_IGN_FN_CASE },
@@ -106,6 +111,7 @@
{ "changed-group-format", required_argument, NULL, OPT_CHANGED_GROUP_FORMAT},
{ "suppress-common-lines", no_argument, NULL, OPT_SUPPRESS_COMMON },
{ "color", optional_argument, NULL, OPT_COLOR },
+ { "version", no_argument, NULL, OPT_VERSION},
{ NULL, 0, 0, '\0'}
};
@@ -294,6 +300,10 @@
diff_format = D_GFORMAT;
group_format = optarg;
break;
+ case OPT_HELP:
+ help = true;
+ usage();
+ break;
case OPT_HORIZON_LINES:
break; /* XXX TODO for compatibility with GNU diff3 */
case OPT_IGN_FN_CASE:
@@ -335,6 +345,9 @@
rflag = true;
noderef = true;
break;
+ case OPT_VERSION:
+ printf("%s\n", diff_version);
+ exit(0);
default:
usage();
break;
@@ -569,9 +582,9 @@
}
static void
-usage(void)
+usage()
{
- (void)fprintf(stderr,
+ (void)fprintf(help ? stdout : stderr,
"usage: diff [-aBbdilpTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]\n"
" [--no-ignore-case] [--normal] [--strip-trailing-cr] [--tabsize]\n"
" [-I pattern] [-F pattern] [-L label] file1 file2\n"
@@ -590,9 +603,13 @@
" [--ignore-blank-lines] [--ignore-case] [--minimal]\n"
" [--no-ignore-file-name-case] [--strip-trailing-cr]\n"
" [--suppress-common-lines] [--tabsize] [--text] [--width]\n"
- " -y | --side-by-side file1 file2\n");
+ " -y | --side-by-side file1 file2\n"
+ " diff [--help] [--version]\n");
- exit(2);
+ if (help)
+ exit(0);
+ else
+ exit(2);
}
static void

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