Comments on: Pro Tips: Color Your Tail With Perl

By: benjaminplee

benjaminplee — Wed, 23 Mar 2011 14:45:14 +0000

Very nice, thanks. Mine was a complete quick and dirty hack. Thanks for the improvement.

By: Ray Miller

Ray Miller — Tue, 22 Mar 2011 22:11:46 +0000

That's not the most efficient way to do things: you are invoking perl three times in the pipeline, and needlessly considering SEVERE lines as maybe ERROR or WARN. A small improvement would be to invoke perl only once and use the '||' operator to short-circuit. As the '-p' is processing a line at a time, you probably don't need the 'g' regex modifier. This works for me: tail -100f $1 | perl -ple 's/^.*SEVERE.*$/\e[1;37;45m$&\e[0m/ || s/^.*ERROR.*$/\e[1;37;41m$&\e[0m/ || s/^.*WARN.*$/\e[1;33;40m$&\e[0m/' Of course there are tools out there to do this sort of thing, for example colortail and ccze .

By: Pro Tips: Color Your Tail With Perl

Pro Tips: Color Your Tail With Perl — Tue, 22 Mar 2011 17:09:10 +0000

[...] 2011-03-22 11:40:40,884 INFO [STDOUT] (main) 11:40:40,884 WARN [ProcessRoles] Could NOT find… [full post] benjaminplee Two Guys Arguing javalinuxbashlogs 0 0 0 0 [...]