Configuration file for grc # grc -c conf.log4j tail -f /usr/local/Cellar/tomcat/7.0.47/libexec/logs/catalina.out

conf.log4j

# From http://fahdshariff.blogspot.ca/2011/04/highlighting-command-output-with.html

# this configuration file is suitable for displaying log files
#errors
regexp=^.*(ERROR|Error|Exception).*$
colours=bold red
======
#stack trace
regexp=^\s+at [^:]*:\d*\)$
colours=red
======
regexp=^.*(FATAL|Fatal).*$
colours=on_red
======
regexp=^.*(WARNING|Warning).*$
colours=bold yellow
======
regexp=^.*(DEBUG|Debug).*$
colours=bold black
======
# this is a time
regexp=[^\d]*\d\d:\d\d:\d\d[\.,]{0,1}\d{0,1}\d{0,1}\d{0,1}
colours=bold blue
count=once
======
# ip number
regexp=\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}
colours=bold magenta
count=more