Applied patch from I.Q. to add sort -u as a feature.

1 files changed, 21 insertions, 7 deletions

diff --git a/coreutils/sort.c b/coreutils/sort.c
index 5ecca8b8f..4f4979cc5 100644
--- a/coreutils/sort.c
+++ b/coreutils/sort.c
@@ -46,8 +46,11 @@ int sort_main(int argc, char **argv)
 #ifdef BB_FEATURE_SORT_REVERSE
         int reverse = FALSE;
 #endif
+#ifdef BB_FEATURE_SORT_UNIQUE
+        int unique = FALSE;
+#endif
 
-        while ((opt = getopt(argc, argv, "nr")) != -1) {
+        while ((opt = getopt(argc, argv, "nru")) != -1) {
                 switch (opt) {
                         case 'n':
                                 compare = compare_numeric;
@@ -57,6 +60,11 @@ int sort_main(int argc, char **argv)
                                 reverse = TRUE;
                                 break;
 #endif
+#ifdef BB_FEATURE_SORT_UNIQUE
+                        case 'u':
+                                unique = TRUE;
+                                break;
+#endif
                         default:
                                 show_usage();
                 }
@@ -81,12 +89,18 @@ int sort_main(int argc, char **argv)
 
         /* print it */
 #ifdef BB_FEATURE_SORT_REVERSE
-        if (reverse)
-                for (i = nlines - 1; 0 <= i; i--)
-                        puts(lines[i]);
-        else
+        if (reverse) {
+                for (i = --nlines; 0 <= i; i--)
+#ifdef BB_FEATURE_SORT_UNIQUE
+                        if((!unique) || (i == nlines) || (strcmp(lines[i + 1], lines[i])))
+#endif
+                                puts(lines[i]);
+        } else
+#endif
+                for (i = 0; i < nlines; i++)
+#ifdef BB_FEATURE_SORT_UNIQUE
+                        if((!unique) || (!i) || (strcmp(lines[i - 1], lines[i])))
 #endif
-        for (i = 0; i < nlines; i++)
-                puts(lines[i]);
+                                puts(lines[i]);
         return EXIT_SUCCESS;
 }