Add an -i option for case insensitive comparison of lines.

From Claus Assmann with minor tweaks by me.

ok millert

2 files changed, 17 insertions, 10 deletions

diff --git a/usr.bin/uniq/uniq.1 b/usr.bin/uniq/uniq.1
index 1c3f10cad8d..a5e1f5ba8c9 100644
--- a/usr.bin/uniq/uniq.1
+++ b/usr.bin/uniq/uniq.1
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: uniq.1,v 1.19 2016/10/24 13:46:58 schwarze Exp $
+.\"	$OpenBSD: uniq.1,v 1.20 2017/12/21 10:05:59 tb Exp $
 .\"	$NetBSD: uniq.1,v 1.5 1994/12/06 07:51:15 jtc Exp $
 .\"
 .\" Copyright (c) 1991, 1993
@@ -33,7 +33,7 @@
 .\"
 .\"     @(#)uniq.1	8.1 (Berkeley) 6/6/93
 .\"
-.Dd $Mdocdate: October 24 2016 $
+.Dd $Mdocdate: December 21 2017 $
 .Dt UNIQ 1
 .Os
 .Sh NAME
@@ -41,7 +41,7 @@
 .Nd report or filter out repeated lines in a file
 .Sh SYNOPSIS
 .Nm uniq
-.Op Fl c
+.Op Fl ci
 .Op Fl d | u
 .Op Fl f Ar fields
 .Op Fl s Ar chars
@@ -73,6 +73,8 @@ in each input line when doing comparisons.
 A field is a string of non-blank characters separated from adjacent fields
 by blanks, with blanks considered part of the following field.
 Field numbers are one based, i.e., the first field is field one.
+.It Fl i
+Case insensitive comparison of lines.
 .It Fl s Ar chars
 Ignore the first
 .Ar chars
@@ -138,13 +140,15 @@ utility is compliant with the
 .St -p1003.1-2008
 specification.
 .Pp
-The use of
+The
+.Fl i
+option and the use of
 .Fl c
 in conjunction with
 .Fl d
 or
 .Fl u
-is an extension to that specification.
+are extensions to that specification.
 .Pp
 The historic
 .Cm + Ns Ar number
diff --git a/usr.bin/uniq/uniq.c b/usr.bin/uniq/uniq.c
index 7e4d7b86a11..e2cc67332ca 100644
--- a/usr.bin/uniq/uniq.c
+++ b/usr.bin/uniq/uniq.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: uniq.c,v 1.24 2015/12/19 10:21:01 schwarze Exp $	*/
+/*	$OpenBSD: uniq.c,v 1.25 2017/12/21 10:05:59 tb Exp $	*/
 /*	$NetBSD: uniq.c,v 1.7 1995/08/31 22:03:48 jtc Exp $	*/
 
 /*
@@ -47,7 +47,7 @@
 
 #define	MAXLINELEN	(8 * 1024)
 
-int cflag, dflag, uflag;
+int cflag, dflag, iflag, uflag;
 int numchars, numfields, repeats;
 
 FILE	*file(char *, char *);
@@ -70,7 +70,7 @@ main(int argc, char *argv[])
 		err(1, "pledge");
 
 	obsolete(argv);
-	while ((ch = getopt(argc, argv, "cdf:s:u")) != -1) {
+	while ((ch = getopt(argc, argv, "cdf:is:u")) != -1) {
 		const char *errstr;
 
 		switch (ch) {
@@ -87,6 +87,9 @@ main(int argc, char *argv[])
 				errx(1, "field skip value is %s: %s",
 				    errstr, optarg);
 			break;
+		case 'i':
+			iflag = 1;
+			break;
 		case 's':
 			numchars = (int)strtonum(optarg, 0, INT_MAX,
 			    &errstr);
@@ -149,7 +152,7 @@ main(int argc, char *argv[])
 		}
 
 		/* If different, print; set previous to new value. */
-		if (strcmp(t1, t2)) {
+		if ((!iflag && strcmp(t1, t2)) || strcasecmp(t1, t2)) {
 			show(ofp, prevline);
 			t1 = prevline;
 			prevline = thisline;
@@ -257,7 +260,7 @@ usage(void)
 	extern char *__progname;
 
 	(void)fprintf(stderr,
-	    "usage: %s [-c] [-d | -u] [-f fields] [-s chars] [input_file [output_file]]\n",
+	    "usage: %s [-ci] [-d | -u] [-f fields] [-s chars] [input_file [output_file]]\n",
 	    __progname);
 	exit(1);
 }