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| Deletions are marked like this. | Additions are marked like this. |
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| Please note that this will not work if the file is empty. ed will also add a newline character to the end of the file if it's missing. |
How do I prepend a text to a file (the opposite of >>)?
You cannot do it with bash redirections alone; the opposite of >> does not exist....
To insert content at the beginning of a file, you can use an editor:
ed -s file << EOF 1i header line 1 header line 2 . w EOF
Please note that this will not work if the file is empty. ed will also add a newline character to the end of the file if it's missing.
Or you can rewrite the file, using things like:
{ echo line; cat file ;} >tmpfile && mv tmpfile file
echo line | cat - file > tmpfile && mv tmpfile fileor lots of other solutions.