"Alvaro M. Piffaretti" wrote:
>
> Hi all,
> I usually have at minimum one log on my X desktop. What I have is an
> xterm
> window positioned on one corner and sized to a comfortable size,
> launched
> from an icon on my desktop.The xterm window runs a "tail -f ..." to
> which one of my /var/log/file I'm interested on.
> I am wondering, does anyone have an idea on how to colorize these logs
> ?. I mean it would be great to have red color for messages like:
>
> "in.telnetd[2330]: connect from [EMAIL PROTECTED]"
>
> for example, and green color for normal informative messages.
> Am I dreaming, or is it possible ?
>
<snip>
Of course! Try something along the following script:
--begin script--
#!/bin/bash
# a few macros to handle color escape sequences:
red_on () { echo -ne '\033[31m' }
green_on () { echo -ne '\033[32m' }
yellow_on () { echo -ne '\033[33m' }
bold_on () { echo -ne '\033[1m' }
extras_off () { echo -ne '\033[m' }
# replace /var/log/messages with "$1" to be
# able to give the desired filename as a arg
# to this script
tail --follow /var/log/messages | \
while read line; do
if dangerous "$line"; then
red_on
bold_on
else
green_on
fi
echo "$line"
extras_off
done
--end script--
'dangerous' can be a shell function to be defined above the while loop
or any other executable that takes a string as an argument and exits
sucessfully when the string contains information that should be printed
in red. What that information is, is up to you, so you must write
'dangerous' yourself.
Then start your xterm with 'xterm -e /path/to/script file_to_watch' (if
you used "$1" above).
This is untested, but straightforward. The escape codes are taken from
SuSE's /etc/rc.config file and may not work for all terminal types. The
right way would be to consult termcap, but then you need C, no?
Marc
--
Marc Mutz <[EMAIL PROTECTED]> http://marc.mutz.com/Encryption-HOWTO/
University of Bielefeld, Dep. of Mathematics / Dep. of Physics
PGP-keyID's: 0xd46ce9ab (RSA), 0x7ae55b9e (DSS/DH)
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