I'm running a watch on a command to monitor the number of open connections for a service we're diagnosing. I need to keep an eye on it while doing other work, to help other developers identify when the service is acting up.
The result of the watch is a number between 1 and 5000. I'd like to show the number as green when it's below 500, yellow when its between 501 and 4000, and red for above 4000.
Is there a command which can set the color easily based on the value of my command?
CCZE may be what you're looking for:
man page over at Ubuntu manuals
On Debian-based systems, you can easily install it via
sudo apt-get install ccze
Use it like this:
tail -f /var/log/syslog | ccze
If the default coloring behavior of ccze is not to your liking, you can extend the functionality through plugins. Sadly, I have never written any as I'm served well with the default behavior, so I can only direct you to the ccze-plugin man page.
I wrote this small script that I named color:
#!/bin/bash
result=$($@)
GREEN="1;32m"
YELLOW="1;33m"
RED="1;31m"
if [ "$result" -lt "500" ]
then
echo -e "\033[$GREEN $result \033[0m" ;
elif [ "$result" -ge "500" -a "$result" -le "4000" ]
then
echo -e "\033[$YELLOW $result \033[0m" ;
else
echo -e "\033[$RED $result \033[0m" ;
fi
You can now run:
watch --color ./color <your command here>
Make sure your command just output a number. Else you got to handle the output correctly and assign it to result variable.
I think you can color the man pages, however (after running several Google searches, I don't think what you're looking for exists.
You could use tput to to put some color in your life. Examples are
tput setf 3 # textcolor green
tput setf 6 # red
tput sgr0 # back to normal
echo "$(tput setf 6)$line$(tput setf sgr0)"
This and more fun with tput on http://www.ibm.com/developerworks/aix/library/au-learningtput/
