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head(1): Provide long options

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Provide long options --bytes and --lines to match -c and -n respectively.
This improves head(1)'s compatibility with its GNU counterpart in a sensible
way.

Reviewed by:	eadler (previous version)
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D14139
This commit is contained in:
kevans 2018-04-10 14:44:07 +00:00
parent 6df8601ce6
commit b75e4698e9
2 changed files with 22 additions and 2 deletions
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14
usr.bin/head/head.1
View File

@ -28,7 +28,7 @@
.\" @(#)head.1 8.1 (Berkeley) 6/6/93
.\" $FreeBSD$
.\"
.Dd March 16, 2013
.Dd April 10, 2018
.Dt HEAD 1
.Os
.Sh NAME
@ -49,6 +49,18 @@ If
.Ar count
is omitted it defaults to 10.
.Pp
The following options are available:
.Bl -tag -width indent
.It Fl c Ar bytes , Fl -bytes Ns = Ns Ar bytes
Print
.Ar bytes
of each of the specified files.
.It Fl n Ar count , Fl -lines Ns = Ns Ar count
Print
.Ar count
lines of each of the specified files.
.El
.Pp
If more than a single file is specified, each file is preceded by a
header consisting of the string
.Dq ==> XXX <==

10
usr.bin/head/head.c
View File

@ -47,6 +47,7 @@ __FBSDID("$FreeBSD$");
#include <ctype.h>
#include <err.h>
#include <getopt.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
@ -64,6 +65,13 @@ static void head_bytes(FILE *, off_t);
static void obsolete(char *[]);
static void usage(void);
static const struct option long_opts[] =
{
{"bytes", required_argument, NULL, 'c'},
{"lines", required_argument, NULL, 'n'},
{NULL, no_argument, NULL, 0}
};
int
main(int argc, char *argv[])
{
@ -74,7 +82,7 @@ main(int argc, char *argv[])
char *ep;
obsolete(argv);
while ((ch = getopt(argc, argv, "n:c:")) != -1)
while ((ch = getopt_long(argc, argv, "+n:c:", long_opts, NULL)) != -1)
switch(ch) {
case 'c':
bytecnt = strtoimax(optarg, &ep, 10);