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works on all Unices
works one bash and ksh.
There is 1 alternative - vote for the best!
Filter comments and empty lines in files. I find this very useful when trying to find what values are actually set in a very long example config file.
I often set an alias for it, like :
alias nocomment='grep -v "^\($\|#\)"'
If you can do better, submit your command here.
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