Colorize tail output

Question

I\'ve been trying to make tail a little more readable for server startups. My current command filters out most of the INFO and DEBUG messages from the startup:

Answer 1

yes, there is way to do this. That is, as long as your terminal supports ANSI escape sequences. This is most terminals that exist.

I think I don't need explain how to grep, sed etc. point is the color right?

see below, this will make

WARN yellow
ERROR red
foo   green

here is example:

kent$ echo "WARN
ERROR
foo"|sed 's#WARN#\x1b[33m&#; s#ERROR#\x1b[31m&#; s#foo#\x1b[32m&#'

Note: \x1b is hexadecimal for the ESC character (^VEsc).

to see the result: