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I know I tried the command when I found it and as I remember it I were able to edit the entire file, but maybe I'm wrong. I found it in some sort of competition or whatever where people were kind of...

I dont think neither sed or awk was involved but then again I could be wrong. I believe it was something like this: cat - >> test < $1
I know that doesn't work but it's what I can remember it looked...

Hi, sometimes one wants to edit files while still seeing output of earlier commands in terminal. I've found out that cat test && cat - >> test does the trick for displaying file content and adding...