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* added (and documented) "-n" option for head -

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contributed Friedrich Vedder <fwv@myrtle.lahn.de>
* Cleanup for a number of usage messages -- also
    contributed Friedrich Vedder <fwv@myrtle.lahn.de>
 -Erik
This commit is contained in:
Erik Andersen
2000-01-23 18:19:02 +00:00
parent 9bc7e89fc1
commit 5509af7073
21 changed files with 110 additions and 105 deletions
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28
coreutils/head.c
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@ -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 $ */