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There are 4 alternatives - vote for the best!
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.
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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sed '='
fwiw nl has lots of options e.g. old school fun:
nl -v10 -i10 ~/bin/helloworld
10 PRINT "hello world"
20 GOTO 10
fwiw nl has lots of options e.g. old school fun:
nl -v10 -i10 ~/bin/helloworld
10 PRINT "hello world"
20 GOTO 10