Example usage :

	mtee 'cat > /tmp/passwd1' 'grep a > /tmp/passwd2' 'grep b > /tmp/passwd3' < /etc/passwd
	

Another form of usage:

$ cat commands 
head -2
grep foo
grep bar
$ cat /etc/passwd | ./mtee --serial --file /tmp/commands 'grep blech'
Creating 4 pipes
popening command 0: head -2
popening command 1: grep foo
popening command 2: grep bar
popening command 3: grep blech
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin

And a third:

$ ps auxww | mtee --quiet --serial 'head -1' 'grep mtee'
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
dstromb+ 32328  0.0  0.0  27820  7108 pts/10   R+   10:22   0:00 python3 /usr/local/bin/mtee --quiet --serial head -1 grep mtee

The help message looks like:

/usr/local/bin/mtee sets up multiple pipes and sends a copy of stdin to each of them

Usage: /usr/local/bin/mtee [--file file_of_commands1] [--help] [--] command1 command2 ... commandn

--help shows this help message
-- signals the end of options, so that commands may start with a "-"
--file filename reads commands to set up pipes with, one command per line
   May be repeated.
--quiet says to operate quietly
--serial says to process the pipes serially, big inhale into virtual memory, use only for small inputs
commandx says to use commandx to set up a pipe

Dec 9, 2020:
Verbose operation no longer outputs two newlines per line for --file.
Eliminated two rare quadratic performance issues.

Dec 8, 2020:
--help writes to stdout.

Oct 24 2005:
Modified to allow use of "-f filename" to read a list of commands from filename

Mar 9, 2005:
Modified to use 1 megabyte blocks, instead of lines. It's now much faster on large files.

You can e-mail the author with questions or comments: