(main): Issue a warning for obsolete usage, unless POSIXLY_CORRECT.

diff --git a/src/sort.c b/src/sort.c
index 6baf40f..2c86177 100644 (file)
--- a/src/sort.c
+++ b/src/sort.c
@@ -2292,6 +2292,10 @@ main (int argc, char **argv)
                }
              else
                {
+                 if (! posix_pedantic)
+                   error (0, 0,
+                          _("warning: `sort %s' is obsolete; use `sort -k'"),
+                          optarg);
                  if (optind != argc && argv[optind][0] == '-'
                      && ISDIGIT (argv[optind][1]))
                    {