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That means you need to interact with the script to select / deselect the relevant lines. Which would make your approach in post #6 moot. You'd need to find the lines, propose them to the user, read...

Again, why the numbered grep detour, opening/reading the file more frequently than necessary? Do you need the line numbers elsewhere?


For numbers, how about


sed -n '/cdc/=' file | sed...

A bit complex, no? And a waste of resources, if you change more than one line, as you open/read your file, create a temp file, and mv it once per change!


If you know the pattern, why the detour...