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Found via the infamous sed one-liners file.



# delete last 2 lines of file

sed 'N;$!P;$!D;$d' < file
printf "This is the new line 4\n"
printf "\n"



---------- Post updated at 08:36...

The file is repeating blocks of text separated by a blank line. Some of the lines are unique.

e.g.:

This is unique line
This is line 2
This is line 3
This is line 4

This is unique line...