Shell one liner to prepend to a file

This still uses a temp file, but at least it is on one line:

echo "text" | cat - yourfile > /tmp/out && mv /tmp/out yourfile

Credit: BASH: Prepend A Text / Lines To a File

echo '0a
your text here
.
w' | ed some_file

ed is the Standard Editor! http://www.gnu.org/fun/jokes/ed.msg.html

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