Combining echo and cat on Unix

Posted by Dan on Stack Overflow See other posts from Stack Overflow or by Dan
Published on 2010-06-09T11:44:27Z Indexed on 2010/06/09 12:12 UTC
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Really simple question, how do I combine echo and cat in the shell, I'm trying to write the contents of a file into another file with a prepended string?

If /tmp/file looks like this:

this is a test

I want to run this:

echo "PREPENDED STRING"
cat /tmp/file | sed 's/test/test2/g' > /tmp/result 

so that /tmp/result looks like this:

PREPENDED STRINGthis is a test2

Thanks.

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