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tee

cat xxx |tee -a logfile

NAME
       tee - read from standard input and write to standard output and files

SYNOPSIS
       tee [OPTION]... [FILE]...

DESCRIPTION
       Copy standard input to each FILE, and also to standard output.

       -a, --append
              append to the given FILEs, do not overwrite

       -i, --ignore-interrupts
              ignore interrupt signals

       --help display this help and exit

       --version
              output version information and exit

       If a FILE is -, copy again to standard output.

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report tee translation bugs to <http://translationproject.org/team/>

AUTHOR
       Written by Mike Parker, Richard M. Stallman, and David MacKenzie.

COPYRIGHT
       Copyright 漏 2013 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       The full documentation for tee is maintained as a Texinfo manual.  If the info and tee programs are properly installed at your site, the command

              info coreutils 'tee invocation'

       should give you access to the complete manual.

/*$NetBSD: tee.c,v 1.11 2013/03/06 11:44:11 yamt Exp $*//* * Copyright (c) 1988, 1993 *The Regents of the University of California.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors *    may be used to endorse or promote products derived from this software *    without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */#include <sys/cdefs.h>#ifndef lint__COPYRIGHT("@(#) Copyright (c) 1988, 1993\ The Regents of the University of California.  All rights reserved.");#endif /* not lint */#ifndef lint#if 0static char sccsid[] = "@(#)tee.c8.1 (Berkeley) 6/6/93";#endif__RCSID("$NetBSD: tee.c,v 1.11 2013/03/06 11:44:11 yamt Exp $");#endif#include <sys/types.h>#include <sys/stat.h>#include <signal.h>#include <errno.h>#include <fcntl.h>#include <unistd.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <locale.h>#include <err.h>typedef struct _list {struct _list *next;int fd;const char *name;} LIST;LIST *head;voidadd(int, const char *);intmain(int, char **);intmain(int argc, char *argv[]){LIST *p;ssize_t rval;int fd;int append, ch, exitval;char *buf;#defineBSIZE (8 * 1024)setlocale(LC_ALL, "");append = 0;while ((ch = getopt(argc, argv, "ai")) != -1)switch((char)ch) {case 'a':append = 1;break;case 'i':(void)signal(SIGINT, SIG_IGN);break;case '?':default:(void)fprintf(stderr, "usage: tee [-ai] [file ...]\n");exit(1);}argv += optind;argc -= optind;if ((buf = malloc(BSIZE)) == NULL)err(1, "malloc");add(STDOUT_FILENO, "stdout");for (exitval = 0; *argv; ++argv)if ((fd = open(*argv, append ? O_WRONLY|O_CREAT|O_APPEND :    O_WRONLY|O_CREAT|O_TRUNC, DEFFILEMODE)) < 0) {warn("%s", *argv);exitval = 1;} elseadd(fd, *argv);while ((rval = read(STDIN_FILENO, buf, BSIZE)) > 0)for (p = head; p; p = p->next) {const char *bp = buf;size_t n = rval;ssize_t wval;do {if ((wval = write(p->fd, bp, n)) == -1) {warn("%s", p->name);exitval = 1;break;}bp += wval;} while (n -= wval);}if (rval < 0) {warn("read");exitval = 1;}for (p = head; p; p = p->next) {if (close(p->fd) == -1) {warn("%s", p->name);exitval = 1;}}exit(exitval);}voidadd(int fd, const char *name){LIST *p;if ((p = malloc(sizeof(LIST))) == NULL)err(1, "malloc");p->fd = fd;p->name = name;p->next = head;head = p;}