Small utility to write to many files at once.

bulkw.c

#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <err.h>
#include <glob.h>

static int write_to(const char *msg, const char *path)
{
    FILE *fp = fopen(path, "w");
    if (!fp) {
        warn("failed to open %s", path);
        return 1;
    }

    fputs(msg, fp);
    fclose(fp);
    return 0;
}

static __attribute__((noreturn)) void usage(FILE *out)
{
    fprintf(out, "usage: %s [data] [files ...]\n", program_invocation_short_name);
    exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}

int main(int argc, char *argv[])
{
    const char *msg = argv[1];
    int rc = 0, i;
    glob_t gl;

    if (argc < 3)
        usage(stderr);

    if (glob(argv[2], 0, NULL, &gl) < 0)
        err(EXIT_FAILURE, "failed to glob %s", argv[2]);

    /* append additional globs */
    for (i = 3; i < argc; ++i) {
        if (glob(argv[i], GLOB_APPEND, NULL, &gl) < 0)
            err(EXIT_FAILURE, "failed to glob %s", argv[i]);
    }

    /* write to each globbed file */
    for (i = 0; i < (int)gl.gl_pathc; ++i)
        rc |= write_to(msg, gl.gl_pathv[i]);

    globfree(&gl);
    return rc;
}

// vim: et:sts=4:sw=4:cino=(0