[alexlarsson]

Yeah, this is obviously a replace vs in-place modify difference. Could replace the script with a simple copy-to-temp+rename-back.

[cryptonector]

Or not use ed(1).

[alexlarsson]

Personally I use magnets to flip bits around, ed(1) seems a bit to bloated for me.

[diegoperini]

Who needs magnets when you have cosmic rays?