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deltaecho

Member

From: Georgia (USA)

Registered: 2008-08-06

Posts: 185

Bash function/script to execute multiple commands on same output

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)

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Dylon

Heller_Barde

Member

Registered: 2008-04-01

Posts: 245

Re: Bash function/script to execute multiple commands on same output

the name is a little unfortunate. there is already a tree utility

cheers Barde

Xyne

Administrator/PM

Registered: 2008-08-03

Posts: 6,963

Website

Re: Bash function/script to execute multiple commands on same output

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)

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deltaecho

Member

From: Georgia (USA)

Registered: 2008-08-06

Posts: 185

Re: Bash function/script to execute multiple commands on same output

the name is a little unfortunate. there is already a tree utility

cheers Barde

...so there is...

My conscience is clear, though, because I didn't know about it until after your post   If the script creates a naming conflict, you may definitely rename it anything you please.

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Dylon

deltaecho

Member

From: Georgia (USA)

Registered: 2008-08-06

Posts: 185

Re: Bash function/script to execute multiple commands on same output

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

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Dylon