8/11/2023 0 Comments Mac grep perlThe atom is supported by BSD extended regular expressions ( egrep, grep -E on BSD compatible system), as well as Perl-compatible REs ( pcregrep, GNU grep -P ). Using Mac OS X terminal to copy a selection of folders to a new location, with merge behavior. How can I do the same thing with perl Basically, I would like to change the following so that it exits with status 1 if no. In regex language the tab symbol is usually encoded by \t atom. With grep I get a failure return code/exit status if no result is found. Note that this works only if the host name can be resolved. I originally tried implementing this with awk, but the command I was typing was getting pretty length and I figured RegEx might be the way to go. The GNU grep(1) also supports Perl-compatible REs as provided by the pcre(3) library. Not sure how portable this is, but you can avoid the whole sed/grep/awk/perl etc with the hostname command and either -i or -I (I recommend hostname -I):-i, -ip-address Display the network address(es) of the host name. However, I got the same result as if I never even piped to perl. 7 Answers Sorted by: 547 grep's -o will only output the matches, ignoring lines wc can count them: grep -o 'needle' file wc -l This will also match 'needles' or 'multineedle'. Then I tried ls | grep 9000 | perl -pe '/^. (?=_. _. )/mg thinking I'd get the following (based on what every online RegEx tester, and specifically, Perl RegEx testers I could find said would work): $ ls | grep 9000 | perl -pe '/^. (?=_. _. )/mg` When I do this, I am able to get a list of only the highest rendition: $ ls | grep 9000 So far, I've been able to do part one, but not part 2. So my goal is to use the 9000 part of the filename to grep only the highest rendition of each (it takes the longest to copy over, so if it's there, the rest of the files are there too), and then extract everything up to the second to last _. I'm trying to move away from AppleScripts for workflows at my job, and create something simpler that can run in the background instead.
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