1 files changed, 9 insertions, 2 deletions

diff --git a/coreutils/uniq.c b/coreutils/uniq.c
index be550b5cd..2b62ad3ae 100644
--- a/coreutils/uniq.c
+++ b/coreutils/uniq.c
@@ -26,6 +26,7 @@
 //usage:     "\n        -c      Prefix lines by the number of occurrences"
 //usage:     "\n        -d      Only print duplicate lines"
 //usage:     "\n        -u      Only print unique lines"
+//usage:     "\n        -i      Ignore case"
 //usage:     "\n        -f N    Skip first N fields"
 //usage:     "\n        -s N    Skip first N chars (after any skipped fields)"
 //usage:     "\n        -w N    Compare N characters in line"
@@ -54,12 +55,13 @@ int uniq_main(int argc UNUSED_PARAM, char **argv)
                 OPT_f = 0x8,
                 OPT_s = 0x10,
                 OPT_w = 0x20,
+                OPT_i = 0x40,
         };
 
         skip_fields = skip_chars = 0;
         max_chars = INT_MAX;
 
-        opt = getopt32(argv, "cduf:+s:+w:+", &skip_fields, &skip_chars, &max_chars);
+        opt = getopt32(argv, "cduf:+s:+w:+i", &skip_fields, &skip_chars, &max_chars);
         argv += optind;
 
         input_filename = argv[0];
@@ -106,7 +108,12 @@ int uniq_main(int argc UNUSED_PARAM, char **argv)
                                 ++cur_compare;
                         }
 
-                        if (!old_line || strncmp(old_compare, cur_compare, max_chars)) {
+                        if (!old_line)
+                                break;
+                        if ((opt & OPT_i)
+                                ? strncasecmp(old_compare, cur_compare, max_chars)
+                                : strncmp(old_compare, cur_compare, max_chars)
+                        ) {
                                 break;
                         }