Pario TechnoBlob » tail http://pario.no A cronological documentation test project, nothing serious, really! Thu, 02 Feb 2012 13:17:58 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 ‘tail -f’ with highlight http://pario.no/2008/09/03/tail-f-with-highlight/ http://pario.no/2008/09/03/tail-f-with-highlight/#comments Wed, 03 Sep 2008 09:01:21 +0000 Hans-Henry Jakobsen http://pario.no/?p=560 This is an example of how you can use tail with colors.

# tail -f /var/log/maillog | perl -pe 's/colorthisword/\e[1;32;40m$&\e[0m/g'

The ;;; values explained

0 all attributes off
1 bold
32 foreground green
40 background black

“colorthisword” 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

Colors
This vector holds the colors used for SGR control sequences parameters 30 to 37 \(foreground colors) and 40 to 47 (background colors).

Parameter Color
30 40 black
31 41 red
32 42 green
33 43 yellow
34 44 blue
35 45 magenta
36 46 cyan
37 47 white

Note
This only works on ANSI terminals

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