How to copy stdin into two files?

Question

I need to have script.sh, that would create files f1.txt and f2.txt with content that was sent to stdin. For example:

echo ABRACODABRA | script.sh

...should create files f1.txt and f2.txt with the content ABRACODABRA.

How can I do this?

Please provide script.sh's body!

score 8 · Accepted Answer · edited May 23 '17 at 12:00

8

You need tee.

$ echo 'foo' | tee f1.txt f2.txt

or

$ echo 'foo' | tee f1.txt > f2.txt

to suppress the additional output to stdout.

I'm guessing your real problem could be how to read from input inside a script. In this case, refer to this question. That will give you something like

while read input; do
    echo $input | tee -a f1.txt > f2.txt
done

edited May 23 '17 at 12:00

Community

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1

answered Jun 24 '12 at 08:04

Lev Levitsky

63,701
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And how can I do it _inside_ script.sh? – Stepan Yakovenko Jun 24 '12 at 08:11
The same way you would outside. – bos Jun 24 '12 at 08:13
What should i write inside script.sh? – Stepan Yakovenko Jun 24 '12 at 08:35
I would ditch the while loop entirely and just run `tee f1.text > f2.txt` (or similar). I can't see any advantage to having the shell read STDIN before passing it to `tee`. – phemmer Jun 24 '12 at 09:23
@Patrick that's what bos says above :) for some reason it didn't satisfy the OP. – Lev Levitsky Jun 24 '12 at 09:43

score 1 · Answer 2 · answered Jun 24 '12 at 08:59

1

Your script can look like this:

 #!/bin/bash
 read msg
 echo $msg > f1.txt
 echo $msg > f2.txt
 exit 0

answered Jun 24 '12 at 08:59

joval

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How to copy stdin into two files?

2 Answers2