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Just annotations of little "how to's", so I know I can find how to do something I've already done when I need to do it again, in case I don't remember anymore, which is not unlikely. Hopefully they can be useful to others, but I can't guarantee that it will work, or that it won't even make things worse.

Append something to the top of a file, in bash, without a temporary file

Posted 09-21-2013 at 04:04 PM by the dsc (linux-related notes)
Updated 09-21-2013 at 04:06 PM by the dsc

Using echo "something" >> extantfile.wtv may be handy way to add something to a file, but it will only add to the end.

The closest thing one would more likely imagine to add something at the top would be something like combining echo/whatever and a cat into a temporary file, and then moving it into the old file. Or maybe something crazy with tac and rev.

But it's possible to skip the temporary file:

echo -e "$(grep -A 1 patternX source-of-bit-to-append)\n$(cat...
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