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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.
There are 2 alternatives - vote for the best!
the sed way to print line numbers
No need $_ netp ;)
This is a joke for @putnamhill and @glaudiston
I'm pretty sure we can write longer if we want ;)
If you can do better, submit your command here.
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