Bash function/script to execute multiple commands on same output

Question

Occasionally, I come across the need to pass the output of a single command to multiple others (without piping each to the next), so today, I wrote a [very] simple Bash script to accomplish the task.  Piping the output of a command to `tree' is much like piping it to `tee', except `tree' allows you to execute multiple commands on the same output, rather than only writing to log files:
#!/bin/bash
# tree -- pipes the output of one command to >= 1 other
# Usage: command | tree 'command 1' 'command 2'
doc=$( cat - )
for arg in "$@"; do
bash -c "${arg}" <<EOF
${doc}
EOF
done
An example of its usage:
$ echo -e "1 2 3\n4 5 6" | tree 'grep 1' 'grep 4' "grep 1 | tee grep.log | awk '{print \$2}'"
1 2 3
4 5 6
2
$ cat grep.log
1 2 3
Though not elaborate, the script gets the job done.
Last edited by deltaecho (2009-03-10 20:34:01)

Answer 1

Xyne wrote:
You could always call it "the Ukrainian Pipe"
(if you can't laugh at this, you either need to loosen up or make a point to follow (annual) current events)
That was a good one