Bash - changing a color of a substring Post: 302597710

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Top Forums Shell Programming and Scripting Bash - changing a color of a substring Post 302597710 by agama on Saturday 11th of February 2012 03:59:46 PM

02-11-2012

Registered User

Unless 'tput' is a shell built-in (it's not in my environment), I'd avoid it as that's an awful lot of process creation. I'd use escape sequences assuming you're working in an xterm environment. This works under xterm run by either Kshell or bash and should illustrate how to change colours using escape sequences:

Code:

#!/usr/bin/env ksh
grey=30
red=31
green=32
yellow=33
blue=34
purple=35
white=36

function colour_string
{
        typeset colour=$1
        shift
        printf  "\e[1;%dm%s" $colour "$*"   set the desired colour with escape, then write string
}

echo "type these characters without spaces:"
desired=( a b c d e f g)
echo "${desired[@]}"
i=0
while read -n 1 x
do
        resp[$i]=$x
        i=$(( i + 1 ))
        if (( i >= ${#desired[@]} ))
        then
                break;
        fi
done

printf "\n"
for (( i = 0; i < ${#desired[@]}; i++ ))
do
        if [[ ${resp[$i]} == ${desired[$i]} ]]
        then
                colour_string $green "${resp[$i]}"
        else
                colour_string $red "${resp[$i]}"
        fi
done
printf "\n"

Last edited by agama; 02-11-2012 at 05:01 PM.. Reason: wording

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atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

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