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Hi glaudiston, you can save a few chars by leaving out cat and pipe and still enjoy the added flexibility.
There are 14 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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