- add support for seq -s <separator>

2 files changed, 12 insertions, 6 deletions

diff --git a/coreutils/seq.c b/coreutils/seq.c
index 899cd696b..cf856bf04 100644
--- a/coreutils/seq.c
+++ b/coreutils/seq.c
@@ -16,8 +16,10 @@ int seq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int seq_main(int argc, char **argv)
 {
         double last, increment, i;
-        enum { OPT_w = 1 };
-        unsigned opt = getopt32(argv, "+w");
+        enum { OPT_w = 1, OPT_s };
+        const char *sep = "\n";
+        bool is_consecutive = 0;
+        unsigned opt = getopt32(argv, "+ws:", &sep);
         unsigned width = 0;
 
         argc -= optind;
@@ -39,9 +41,12 @@ int seq_main(int argc, char **argv)
 
         /* You should note that this is pos-5.0.91 semantics, -- FK. */
         while ((increment > 0 && i <= last) || (increment < 0 && i >= last)) {
-                printf("%0*g\n", width, i);
+                if (is_consecutive++) {
+                        printf("%s", sep);
+                }
+                printf("%0*g", width, i);
                 i += increment;
         }
-
+        bb_putchar('\n');
         return fflush(stdout);
 }
diff --git a/include/usage.h b/include/usage.h
index 4360edba6..f9b6aca1b 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -3594,12 +3594,13 @@
      "\nOther options are silently ignored; -oi is implied" \
 
 #define seq_trivial_usage \
-       "[-w] [first [increment]] last"
+       "[-w] [-s separator] [first [increment]] last"
 #define seq_full_usage "\n\n" \
        "Print numbers from FIRST to LAST, in steps of INCREMENT.\n" \
        "FIRST, INCREMENT default to 1\n" \
      "\nArguments:" \
-     "\n       -w          Pad to last with leading zeros" \
+     "\n        -w          Pad to last with leading zeros" \
+     "\n        -s <string> Use string separator" \
      "\n        LAST" \
      "\n        FIRST LAST" \
      "\n        FIRST INCREMENT LAST" \