SUpport old style -[::digit::] options for head and tail

Also make head behave like GNU head (-0/-n 0 is valid)

2 files changed, 11 insertions, 1 deletions

diff --git a/coreutils/head.c b/coreutils/head.c
index 4a1677146..c5c11fc7b 100644
--- a/coreutils/head.c
+++ b/coreutils/head.c
@@ -47,12 +47,17 @@ int head_main(int argc, char **argv)
         FILE *fp;
         int need_headers, opt, len = 10, status = EXIT_SUCCESS;
 
+        if (( argc >= 2 ) && ( strlen ( argv [1] ) >= 2 ) && ( argv [1][0] == '-' ) && isdigit ( argv [1][1] )) {
+                len = atoi ( &argv [1][1] );
+                optind = 2;
+        }
+
         /* parse argv[] */
         while ((opt = getopt(argc, argv, "n:")) > 0) {
                 switch (opt) {
                 case 'n':
                         len = atoi(optarg);
-                        if (len >= 1)
+                        if (len >= 0)
                                 break;
                         /* fallthrough */
                 default:
diff --git a/coreutils/tail.c b/coreutils/tail.c
index 0c8dec26a..8201c80a0 100644
--- a/coreutils/tail.c
+++ b/coreutils/tail.c
@@ -68,6 +68,11 @@ int tail_main(int argc, char **argv)
         char *s, *start, *end, buf[BUFSIZ];
         int i, opt;
 
+        if (( argc >= 2 ) && ( strlen ( argv [1] ) >= 2 ) && ( argv [1][0] == '-' ) && isdigit ( argv [1][1] )) {
+                count = atoi ( &argv [1][1] );
+                optind = 2;
+        }
+
         while ((opt = getopt(argc, argv, "c:fhn:q:s:v")) > 0) {
                 switch (opt) {
                         case 'f':