ubase/watch.c

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C
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/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
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#include <unistd.h>
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#include "util.h"
static void
usage(void)
{
eprintf("usage: %s [-t] [-n interval] command\n", argv0);
}
int
main(int argc, char *argv[])
{
char cmd[BUFSIZ];
int i, interval = 2;
ARGBEGIN {
case 't':
break;
case 'n':
/* Only whole seconds for now */
interval = estrtol(EARGF(usage()), 10);
break;
default:
usage();
} ARGEND;
if (argc < 1)
usage();
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if (strlcpy(cmd, argv[0], sizeof(cmd)) >= sizeof(cmd))
eprintf("command too long\n");
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for (i = 1; i < argc; i++) {
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if (strlcat(cmd, " ", sizeof(cmd)) >= sizeof(cmd))
eprintf("command too long\n");
if (strlcat(cmd, argv[i], sizeof(cmd)) >= sizeof(cmd))
eprintf("command too long\n");
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}
for (;;) {
printf("\x1b[2J\x1b[H"); /* clear */
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fflush(NULL);
system(cmd);
sleep(interval);
}
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return 0;
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}