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I would go for (echo 'ble'; cat todo.txt) :-)
– Ciro Santilli OurBigBook.com
Commented Dec 4, 2018 at 9:37
I would use tee instead of sponge which come by default on most distro echo "task goes here" | cat - todo.txt | tee todo.txt
– Angel115
Commented Apr 28, 2020 at 17:12
1

The tee example is not correct askubuntu.com/a/752451
– Zombo
Commented May 1, 2020 at 14:51
@stevenpenny Good point. Now I remember why I didn't suggest it originally. I came back to this answer not noticing that the output file name was the same as the input, which is why you need sponge to buffer it all before writing it back out.
– slhck
Commented May 2, 2020 at 12:07

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