/*
 * tee: pipe fitting
 */
#include <stdio.h>

char append=0;

main(argc, argv)
char **argv;
{
    char text[200];
    FILE *tee;

    if (argc > 1 && strcmp(argv[1], "-a") == 0) {
	++argv;
	--argc;
	append = 1;
    }
    if (argc < 2) {
	fprintf(stderr, "usage: tee [-a] file\n");
	exit(99);
    }
    if (tee = fopen(argv[1], append ? "ab" : "wb")) {
	while (fgets(text, 200, stdin)) {
	    fputs(text, stdout);
	    fputs(text, tee);
	}
	close(tee);
	exit(0);
    }
    fprintf(stderr, "tee: can't open %s\n", argv[1]);
    exit(1);
}