Unix Tip #4291- December 10, 2012


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TAIL WITH COLOR



Here is how to monitor a growing
file and have it highlight a
KEYWORD:


$ tail -f FILE | perl -pe 's/KEYWORD/\e[1;31;43m$&\e[0m/g'

Replace FILE with the file to tail
Replace KEYWORD with the word to highlight.

0 : all attributes off
1 : bold
31 : foreground red
43 : background yellow

"keyword", of course, can be any perl regular expression:

(foo|bar) - highlight the strings foo and bar
\b((foo|bar)\b - highlight the words foo and bar
.*\b((foo|bar)\b.* - highlight the whole line that contains the words foo or bar

NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted by various unix admins around the globe. UGU suggest you read and test each tip in a non-volitile environment before placing into production.


LAST 5 TIPS
4290 - MERGING TWO FILES
4289 - BACKING UP PASSWORDS
4288 - DIFFERENCES WITHOUT USING DIFF
4287 - WHAT AM I LISTENING FOR?
4286 - HIDING ECHO


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