[SOLVED] bash question: searching for info and changing the color of keywords in the results

chicone · 05-05-2011, 01:06 PM

(bare with me as I am sort of new with scripting)
I am trying to figure out how to run a script that does a basic chkconfig and to get only those services that are running, but changing the color of "on" to red in my output file.

Here is what I am working with so far:

Quote:

#/bin/bash

RED=$(tput setaf 1)
BLK=$(tput setaf 0)

echo "" > /tmp/services.txt

echo "Here are the running services. Those with RL's that are turned on are in ${RED}red${BLK}:" >> /tmp/services.txt

echo "" >> /tmp/services.txt

chkconfig --list | grep <colon_symbol>on | sort >> /tmp/services

the results would return something similar to (I am only listing a couple of services for shortness) when the red is working:

Quote:

httpd 1-off 2-off 3-on 4-off 5-on 6-off
sshd 1-off 2-off 3-on 4-off 5-on 6-off

*I had to substitute a "-" and <colon_symbol> for ":" in front of the on's, because the forum thought they were smiley faces (i.e.

n)

as you can see, I have no idea how to make the "on" to be red while the rest of everything remains in black text. I have been trying to read up on sed and awk, but it is still pretty much a mystery to me right now. There will be other things in the output file that I wouldn't want a rogue "on" to be in red, so just the instances of "on" in that one chkconfig return.

Thanks.

Nominal Animal · 05-05-2011, 01:28 PM

Filter the output thorough

Code:

sed -e 's|\([\t :-]\)\([Oo][Nn]\)\([\t ]\)|\1\x1B[0;31m\2\x1B[0m\3|g;
        s|\([\t :-]\)\([Oo][Nn]\)$|\1\x1B[0;31m\2\x1B[0m|;
        s|^\([^\t ]\+\)\([\t ]\)|\x1B[1;33m\1\x1B[0m\2|'

The \x1B[0;33m is the ANSI code for dark red, \x1B[1;33m is the ANSI code for yellow, and \x1B[0m returns to defaults.

chicone · 05-05-2011, 03:49 PM

Thanks for posting. I tried that, but obviously messed something up. However, I did take some of what you had and googled it and found someone else who had a similar problem. This is what they came up with (I changed it very slightly to match what I needed)

sed ''/

n/s//`printf "\033[31m

n\033[0m"`/'g'

well, they smilies are : on (without the space in between)

firstfire · 05-05-2011, 10:55 PM

Hi.
Maybe this Perl script from this book could be useful too (I believe it is open source):

Code:

#!/usr/bin/perl -w
# Author calls this script rcg - Regexp Color Glasses
# Linux Server Hacks, p.209 (russian) (N 75)
use strict;
use Term::ANSIColor qw(:constants);

my %target = ();

while( my $arg = shift ) {
	my $clr = shift;

	if(($arg=~ /^-/) | (!$clr)) {
		print "Usage: rcg [regex] [color] [regex] [color] ...\n";
		exit;
	}

	$target{$arg} = eval($clr);
}

my $rst = RESET;

#  adding  of `i' at the tail of s///g
#  causes case-insensitive match
while(<>) {
	foreach my $x ( keys(%target) ) {
		s/($x)/$target{$x}$1$rst/gi;
	}
	print;
}

Example:

Code:

$ ps -Af | rcg 'gnome.*' RED 'kde.*' BLUE | less -r

theNbomr · 05-06-2011, 08:38 AM

Text does not have any color. Only the terminal or other output device understands any concept of color, and the methods used to convey color information vary from device to device. The way you apply color attributes to text on an ANSI terminal is different from the method used to color text on a Postscript file, and different from the methods used to render color attributes on other styles of terminals, and different again when displayed in a word processor or spreadsheet, and different still for every make and model of color printer.
Your question can only be answered accurately when the parameters of the output device(s) are narrowly defined.

--- rod.