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There's too many options to number,
My curiosity has forced me to make it using only sed.
Maybe useful... or not... :-S
There are 3 alternatives - vote for the best!
the sed way to print line numbers
If you don't have nl on your system, this achieves a similar effect, the default behavior in nl is to not number blank lines, but this does.
No need $_ netp ;)
If you can do better, submit your command here.
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