sbase/env.c

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/* See LICENSE file for copyright and license details. */
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "util.h"
extern char **environ;
static void
usage(void)
{
eprintf("usage: env [-i] [-u name]... [name=value]... [cmd [arg...]]\n");
}
int
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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++);
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return 0;
}