sbase/env.c
FRIGN 616379f8ca Add mandoc-manpage for env(1)
and mark it as finished in the README.
2015-01-24 00:22:06 +01:00

46 lines
732 B
C

/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "util.h"
extern char **environ;
static void
usage(void)
{
eprintf("usage: env [-i] [-u variable] ... [variable=value] ... [cmd [arg ...]]\n");
}
int
main(int argc, char *argv[])
{
ARGBEGIN {
case 'i':
if(environ)
*environ = NULL;
break;
case 'u':
unsetenv(EARGF(usage()));
break;
default:
usage();
} ARGEND;
for (; *argv && strchr(*argv, '='); argv++)
putenv(*argv);
if (*argv) {
execvp(*argv, argv);
enprintf(127 - (errno != EEXIST), "env: '%s':", *argv);
}
while (environ && *environ)
printf("%s\n", *environ++);
return 0;
}