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authorGravatar Erik Andersen <andersen@codepoet.org>2000-01-23 18:19:02 +0000
committerGravatar Erik Andersen <andersen@codepoet.org>2000-01-23 18:19:02 +0000
commit5509af7073ffff75d86ff8c67a2075169a859efd (patch)
tree2728cbb296484026cb657f92f78e1bb0806ba6f4 /coreutils/head.c
parent9bc7e89fc1eb493c06494ad86781ab49fc28c509 (diff)
downloadbusybox-5509af7073ffff75d86ff8c67a2075169a859efd.tar.gz
busybox-5509af7073ffff75d86ff8c67a2075169a859efd.tar.bz2
* added (and documented) "-n" option for head -
contributed Friedrich Vedder <fwv@myrtle.lahn.de> * Cleanup for a number of usage messages -- also contributed Friedrich Vedder <fwv@myrtle.lahn.de> -Erik
Diffstat (limited to 'coreutils/head.c')
-rw-r--r--coreutils/head.c28
1 files changed, 15 insertions, 13 deletions
diff --git a/coreutils/head.c b/coreutils/head.c
index 7f08a8041..4e58bdcd7 100644
--- a/coreutils/head.c
+++ b/coreutils/head.c
@@ -26,10 +26,12 @@
#include <stdio.h>
const char head_usage[] =
-"Usage: head [FILE]...\n\n"
+"head [OPTION] [FILE]...\n\n"
"Print first 10 lines of each FILE to standard output.\n"
"With more than one FILE, precede each with a header giving the\n"
-"file name. With no FILE, or when FILE is -, read standard input.\n";
+"file name. With no FILE, or when FILE is -, read standard input.\n\n"
+"Options:\n"
+"\t-n NUM\t\tPrint first NUM lines instead of first 10\n";
int
head(int len, FILE *src)
@@ -49,22 +51,22 @@ head(int len, FILE *src)
int
head_main(int argc, char **argv)
{
- int i = 1;
char opt;
- int len = 10;
-
- /* 1st option is potentially special */
- if ((argc > 1) && (argv[1][0] == '-') && isDecimal(argv[1][1])) {
- int tmplen = atoi(&argv[1][1]);
- if (tmplen) { len = tmplen; }
- i = 2;
- }
+ int len = 10, tmplen, i;
/* parse argv[] */
- for ( ; i < argc; i++) {
+ for (i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
opt = argv[i][1];
switch (opt) {
+ case 'n':
+ tmplen = 0;
+ if (i++ < argc)
+ tmplen = atoi(argv[i]);
+ if (tmplen < 1)
+ usage(head_usage);
+ len = tmplen;
+ break;
case '-':
case 'h':
usage(head_usage);
@@ -103,4 +105,4 @@ head_main(int argc, char **argv)
exit(0);
}
-/* $Id: head.c,v 1.4 1999/12/17 18:52:06 erik Exp $ */
+/* $Id: head.c,v 1.5 2000/01/23 18:19:02 erik Exp $ */