colortest.sh

#!/bin/bash
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# colortest (tests the colors of your terminal using ANSI codes)
# 
# written by: Josh D. Dotson, Oct 9th, 2011
# License as follows:
#    Copyright (c) 2011 Josh D. Dotson
# 
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# THE BERKLEY COPYRIGHT (SUBSTITUTE ALL REFERENCES TO BERKLEY UNIVERSITY WITH "AUTHOR").
# THE DISCLAIMER IS APPLICABLE EITHER WAY, USING THE ABOVE SENTENCE
# REGARDING SUBSTITUTION OF TEXT.
#
# BERKLEY COPYRIGHT:
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#
# HOW TO USE:
#   ./colortest (optional character to use instead of "O")
#
# Purpose:
#   To show you if colors are available on your terminal, and what they look like.
#   
# ANSI code format:
#   echo -ne "\033[00;38;5;007m"
#
#  the "n" in "-ne" tells bash not to put a newline at the end of the echo
#  the "e" in "-ne" tells bash interpret the escape sequences
#  the "\033" in the code is the escape character
#  the fourth group (007) is the color index for the palate
#
#  Maybe someone with a higher understanding of the code could correct this?
#  The values seem to be added together somehow, but I am too lazy to find it...

m="m"
br_a=8
br_b=$(($br_a + 8))
br_c=$(($br_b + 36)); br_d=$(($br_c + 36)); br_e=$(($br_d + 36))
br_f=$(($br_e + 36)); br_g=$(($br_f + 36)); br_h=$(($br_g + 36))
c_dim=2; c_norm=0; c_bold=1; c_inverse=7; c_undl=4; c_strk=9; norm='\033[0m'
y=8; x=5

function alpha(){
      for t in 0 1 2; do
         for u in 0 1 2 3 4 5 6 7 8 9; do
            for v in 0 1 2 3 4 5 6 7 8 9; do
               if [ $t$u$v -eq $br_a ];then echo ""; fi  # These if's break the line
               if [ $t$u$v -eq $br_b ];then echo ""; fi  # in a desired place to show
#               if [ $t$u$v -eq $br_c ];then echo ""; fi  # the association of the colors.
#               if [ $t$u$v -eq $br_d ];then echo ""; fi  # Feel free to uncomment
               if [ $t$u$v -eq $br_e ];then echo ""; fi  # more if's to slim display.
#               if [ $t$u$v -eq $br_f ];then echo ""; fi
#               if [ $t$u$v -eq $br_g ];then echo ""; fi
               if [ $t$u$v -eq $br_h ];then echo ""; fi
               if [ $t$u$v -lt 256 ];then
                     echo -ne "\033[0$z;3$y;$x;$t$u$v$m$char$norm"
               fi
            done
         done
      done
echo ""
}

echo -e "line 1=regular (8) [+0]\nline 2=bright (8) [+8]\nline 3/4=colorscale (216) [+16]\nlast line=grayscale (24) [+232]\n"
if [ "x$1" == "x" ];then char="O"; else char="$1"; fi

#set the attribute; echo the selected char using attribute; display code used; then print table using attribute
z=$c_dim; echo -ne "\033[0$z;3$y;$x;007$m$char$norm "; echo "Attribute: Dim;      \033[0$z;3$y;$x;007$m"; alpha; echo ""
z=$c_norm; echo -ne "\033[0$z;3$y;$x;007$m$char$norm "; echo "Attribute: Normal;      \033[0$z;3$y;$x;007$m"; alpha; echo ""
z=$c_bold; echo -ne "\033[0$z;3$y;$x;007$m$char$norm "; echo "Attribute: Bold;      \033[0$z;3$y;$x;007$m"; alpha; echo ""
z=$c_inverse; echo -ne "\033[0$z;3$y;$x;007$m$char$norm "; echo "Attribute: Inverse;      \033[0$z;3$y;$x;007$m"; alpha; echo ""
z=$c_undl; echo -ne "\033[0$z;3$y;$x;007$m$char$norm "; echo "Attribute: Underline;      \033[0$z;3$y;$x;007$m"; alpha; echo ""
z=$c_strk; echo -ne "\033[0$z;3$y;$x;007$m$char$norm "; echo "Attribute: Strike-through;   \033[0$z;3$y;$x;007$m"; alpha; echo ""