RE: A note on the use of grep [WAS: Re: HELP! My printer won't stop!!]
>>> ps aux | grep [l]pr
>>> This still lists all the processes that contain the string "lpr",
>>> but it will not match the grep process itself anymore.
>> Why is that? Isn't a bracket expression containing only one
>> character exactly the same as the character by itself? Am I missing
>> something blindingly obvious? :)
> As you point out, the brackets with one character amount to a range
> of one character. The "[l]pr" regexp is intrepreted as "lpr", but
> the grep command show up in ps as "grep [l]pr". This prevents grep
> from matching its own process as it is output by ps.
</me slaps forehead>
Thanks, guess I didn't think hard enough. :) Nice trick, BTW...