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#!/bin/bash useage() { printf "\n\e[1;4mAscii Escape Code Helper Utility\e[m\n\n" printf " \e[1mUseage:\e[m colors.sh [-|-b|-f|-bq|-fq|-?|?] [start] [end] [step]\n\n" printf "The values for the first parameter may be one of the following:\n\n" printf " \e[1m-\e[m Will result in the default output.\n" printf " \e[1m-b\e[m This will display the 8 color version of this chart.\n" printf " \e[1m-f\e[m This will display the 256 color version of this chart using foreground colors.\n" printf " \e[1m-q\e[m This will display the 256 color version of this chart without the extra text.\n" printf " \e[1m-bq\e[m This will display the 8 color version of this chart without the extra text.\n" printf " \e[1m-fq\e[m This will display the 256 color version of this chart using foreground colors without the extra text.\n" printf " \e[1m-?|?\e[m Displays this help screen.\n" printf "\nThe remaining parameters are only used if the first parameter is one of: \e[1m-,-f,q,fq\e[m\n\n" printf " \e[1mstart\e[m The color index to begin display at.\n" printf " \e[1mend\e[m The color index to stop display at.\n" printf " \e[1mstart\e[m The number of indexes to increment color by each iteration.\n\n\n" } verbose() { if [[ "$1" != "-q" && "$1" != "-fq" && "$1" != "-bq" ]]; then printf "\nTo control the display style use \e[1m%s\e[m where \e[1m%s\e[m is:\n" '\e[{$value}[:{$value}]m' '{$value}' printf "\n 0 Normal \e[1m1 Bold\e[m \e[2m2 Dim\e[m \e[3m3 ???\e[m \e[4m4 Underlined\e[m \e[5m5 Blink\e[m \e[6m6 ???\e[m \e[7m7 Inverted\e[m \e[8m8 Hidden\e[m\n\n" printf "If \e[1m%s\e[m is not provided it will reset the display.\n\n" '{$value}' fi } eight_color() { local fgc bgc vals seq0 if [ "$1" != "-bq" ]; then printf "\n\e[1;4m8 Color Escape Value Pallette\e[m\n\n" printf "Color escapes are \e[1m%s\e[m\n" '\e[${value};...;${value}m' printf " Values \e[1m30..37\e[m are \e[1mforeground\e[m colors\n" printf " Values \e[1m40..47\e[m are \e[1mbackground\e[m colors\n\n" fi for fgc in {30..37}; do for bgc in {40..47}; do fgc=${fgc#37} bgc=${bgc#40} vals="${fgc:+$fgc;}${bgc}" vals=${vals%%;} seq0="${vals:+\e[${vals}m}" printf " %-9s" "${seq0:-(default)}" printf " ${seq0}TEXT\e[m" printf " \e[${vals:+${vals+$vals;}}1mBOLD\e[m" done printf "\e[0m\n" done } if [[ "$1" == "-b" || "$1" == "-bq" ]]; then eight_color "$1" verbose "$1" elif [[ "$1" == "-" || "$1" == "-f" || "$1" == "-q" || "$1" == "-fq" ]]; then start=${2:-0} end=${3:-255} step=${4:-1} color=$start style="48;5;" if [[ "$1" == "-f" || "$1" == "-fq" ]]; then style="38;5;" fi perLine=$(( ( $(tput cols) - 2 ) / 9 )); if [[ "$1" != "-q" && "$1" != "-fq" ]]; then printf "\n\e[1;4m256 Color Escape Value Pallette\e[0m\n\n" printf " \e[1m%s\e[m for \e[1mbackground\e[m colors\n \e[1m%s\e[m for \e[1mforeground\e[m colors\n\n" '\e[48;5;${value}m' '\e[38;5;${value}m' fi while [ $color -le $end ]; do printf "\e[m \e[${style}${color}m %3d \e[m " $color ((color+=step)) if [ $(( ( ( $color - $start ) / $step ) % $perLine )) -eq 0 ]; then printf "\n" fi done printf "\e[m\n" verbose "$1" else useage fi 

#!/bin/bash useage() { printf "\n\e[1;4mAscii Escape Code Helper Utility\e[m\n\n" printf " \e[1mUseage:\e[m colors.sh [-|-b|-f|-bq|-fq|-?|?] [start] [end] [step]\n\n" printf "The values for the first parameter may be one of the following:\n\n" printf " \e[1m-\e[m Will result in the default output.\n" printf " \e[1m-b\e[m This will display the 8 color version of this chart.\n" printf " \e[1m-f\e[m This will display the 256 color version of this chart using foreground colors.\n" printf " \e[1m-q\e[m This will display the 256 color version of this chart without the extra text.\n" printf " \e[1m-bq\e[m This will display the 8 color version of this chart without the extra text.\n" printf " \e[1m-fq\e[m This will display the 256 color version of this chart using foreground colors without the extra text.\n" printf " \e[1m-?|?\e[m Displays this help screen.\n" printf "\nThe remaining parameters are only used if the first parameter is one of: \e[1m-,-f,q,fq\e[m\n\n" printf " \e[1mstart\e[m The color index to begin display at.\n" printf " \e[1mend\e[m The color index to stop display at.\n" printf " \e[1mstart\e[m The number of indexes to increment color by each iteration.\n\n\n" } verbose() { if [[ "$1" != "-q" && "$1" != "-fq" && "$1" != "-bq" ]]; then printf "\nTo control the display style use \e[1m%s\e[m where \e[1m%s\e[m is:\n" '\e[{$value}[:{$value}]m' '{$value}' printf "\n 0 Normal \e[1m1 Bold\e[m \e[2m2 Dim\e[m \e[3m3 ???\e[m \e[4m4 Underlined\e[m \e[5m5 Blink\e[m \e[6m6 ???\e[m \e[7m7 Inverted\e[m \e[8m8 Hidden\e[m\n\n" printf "If \e[1m%s\e[m is not provided it will reset the display.\n\n" '{$value}' fi } eight_color() { local fgc bgc vals seq0 if [ "$1" != "-bq" ]; then printf "\n\e[1;4m8 Color Escape Value Pallette\e[m\n\n" printf "Color escapes are \e[1m%s\e[m\n" '\e[${value};...;${value}m' printf " Values \e[1m30..37\e[m are \e[1mforeground\e[m colors\n" printf " Values \e[1m40..47\e[m are \e[1mbackground\e[m colors\n\n" fi for fgc in {30..37}; do for bgc in {40..47}; do fgc=${fgc#37} bgc=${bgc#40} vals="${fgc:+$fgc;}${bgc}" vals=${vals%%;} seq0="${vals:+\e[${vals}m}" printf " %-9s" "${seq0:-(default)}" printf " ${seq0}TEXT\e[m" printf " \e[${vals:+${vals+$vals;}}1mBOLD\e[m" done printf "\e[0m\n" done } if [[ "$1" == "-b" || "$1" == "-bq" ]]; then eight_color "$1" verbose "$1" elif [[ "$1" == "" || "$1" == "-" || "$1" == "-f" || "$1" == "-q" || "$1" == "-fq" ]]; then start=${2:-0} end=${3:-255} step=${4:-1} color=$start style="48;5;" if [[ "$1" == "-f" || "$1" == "-fq" ]]; then style="38;5;" fi perLine=$(( ( $(tput cols) - 2 ) / 9 )); if [[ "$1" != "-q" && "$1" != "-fq" ]]; then printf "\n\e[1;4m256 Color Escape Value Pallette\e[0m\n\n" printf " \e[1m%s\e[m for \e[1mbackground\e[m colors\n \e[1m%s\e[m for \e[1mforeground\e[m colors\n\n" '\e[48;5;${value}m' '\e[38;5;${value}m' fi while [ $color -le $end ]; do printf "\e[m \e[${style}${color}m %3d \e[m " $color ((color+=step)) if [ $(( ( ( $color - $start ) / $step ) % $perLine )) -eq 0 ]; then printf "\n" fi done printf "\e[m\n" verbose "$1" else useage fi 

#!/bin/bash # These are mostly useless but you may like to play around with them to customize # the pallette. It appears that the colors cycle every 256 colors. start=${2:-0} end=${3:-255} step=${4:-1} color=$start style="48;5;"   if [[ "$1" == "-f" || "$1" == "-fq" ]]; then style="38;5;" fi   perLine=$(( ( $(tput cols) - 2 ) / 9 )); while [ $color -le $end ]; do printf "\e[0m \e[${style}${color}m %3d \e[0m " $color ((color+=step)) if [ $(( ( ( $color - $start ) / $step ) % $perLine )) -eq 0 ]; then printf "\n"  fi done printf "\e[0m\n" if [[ "$1" != "-q" && "$1" != "-fq" ]]; then printf "\n  0 Normal \e[1m1 Bold\e[0m \e[2m2 Dim\e[0m \e[3m3 ???\e[0m \e[4m4 Underlined\e[0m \e[5m5 Blink\e[0m \e[6m6 ???\e[0m \e[7m7 Inverted\e[0m \e[8m8 Hidden\e[0m\n" fi 

#!/bin/bash useage() {  printf "\n\e[1;4mAscii Escape Code Helper Utility\e[m\n\n"  printf " \e[1mUseage:\e[m colors.sh [-|-b|-f|-bq|-fq|-?|?] [start] [end] [step]\n\n" printf "The values for the first parameter may be one of the following:\n\n"  printf " \e[1m-\e[m Will result in the default output.\n"  printf " \e[1m-b\e[m This will display the 8 color version of this chart.\n"  printf "  \e[1m-f\e[m This will display the 256 color version of this chart using foreground colors.\n"  printf " \e[1m-q\e[m This will display the 256 color version of this chart without the extra text.\n" printf " \e[1m-bq\e[m This will display the 8 color version of this chart without the extra text.\n" printf " \e[1m-fq\e[m This will display the 256 color version of this chart using foreground colors without the extra text.\n" printf " \e[1m-?|?\e[m Displays this help screen.\n" printf "\nThe remaining parameters are only used if the first parameter is one of: \e[1m-,-f,q,fq\e[m\n\n" printf " \e[1mstart\e[m The color index to begin display at.\n" printf " \e[1mend\e[m The color index to stop display at.\n" printf " \e[1mstart\e[m The number of indexes to increment color by each iteration.\n\n\n" } verbose() { if [[ "$1" != "-q" && "$1" != "-fq" && "$1" != "-bq" ]]; then printf "\nTo control the display style use \e[1m%s\e[m where \e[1m%s\e[m is:\n" '\e[{$value}[:{$value}]m' '{$value}' printf "\n 0 Normal \e[1m1 Bold\e[m \e[2m2 Dim\e[m \e[3m3 ???\e[m \e[4m4 Underlined\e[m \e[5m5 Blink\e[m \e[6m6 ???\e[m \e[7m7 Inverted\e[m \e[8m8 Hidden\e[m\n\n" printf "If \e[1m%s\e[m is not provided it will reset the display.\n\n" '{$value}' fi } eight_color() { local fgc bgc vals seq0 if [ "$1" != "-bq" ]; then printf "\n\e[1;4m8 Color Escape Value Pallette\e[m\n\n" printf "Color escapes are \e[1m%s\e[m\n" '\e[${value};...;${value}m'  printf " Values \e[1m30..37\e[m are \e[1mforeground\e[m colors\n" printf " Values \e[1m40..47\e[m are \e[1mbackground\e[m colors\n\n" fi for fgc in {30..37}; do for bgc in {40..47}; do fgc=${fgc#37} bgc=${bgc#40} vals="${fgc:+$fgc;}${bgc}" vals=${vals%%;} seq0="${vals:+\e[${vals}m}" printf " %-9s" "${seq0:-(default)}" printf " ${seq0}TEXT\e[m" printf " \e[${vals:+${vals+$vals;}}1mBOLD\e[m" done printf "\e[0m\n" done } if [[ "$1" == "-b" || "$1" == "-bq" ]]; then eight_color "$1" verbose "$1" elif [[ "$1" == "-" || "$1" == "-f" || "$1" == "-q" || "$1" == "-fq" ]]; then start=${2:-0}  end=${3:-255}  step=${4:-1}  color=$start  style="48;5;"  if [[ "$1" == "-f" || "$1" == "-fq" ]]; then   style="38;5;"  fi  perLine=$(( ( $(tput cols) - 2 ) / 9 )); if [[ "$1" != "-q" && "$1" != "-fq" ]]; then printf "\n\e[1;4m256 Color Escape Value Pallette\e[0m\n\n" printf " \e[1m%s\e[m for \e[1mbackground\e[m colors\n \e[1m%s\e[m for \e[1mforeground\e[m colors\n\n" '\e[48;5;${value}m' '\e[38;5;${value}m' fi  while [ $color -le $end ]; do   printf "\e[m \e[${style}${color}m %3d \e[m " $color   ((color+=step))   if [ $(( ( ( $color - $start ) / $step ) % $perLine )) -eq 0 ]; then printf "\n" fi  done printf "\e[m\n"  verbose "$1" else  useage fi 

Another script like the one posted by TAFKA 'goldilocks' for displaying colors which is maybe a little more practical for reference purposes:

#!/bin/bash # These are mostly useless but you may like to play around with them to customize # the pallette. It appears that the colors cycle every 256 colors. start=${2:-0}; end=${3:-255};  step=${4:-1}; color=$start; style="48;5;"; if [[ "$1" == "-f" || "$1" == "-fq" ]]; then style="38;5;"; fi perLine=$(( ( $(tput cols) - 2 ) / 9 )); while [ $color -le $end ]; do printf "\e[0m \e[${style}${color}m %3d \e[0m " $color ((color+=step)); if [ $(( ( ( $color - $start ) / $step ) % $perLine )) -eq 0 ]; then printf "\n" fi done if [[ "$1" != "-q" && "$1" != "-fq" ]]; then printf "\e[0m\n\n 0 Normal \e[1m1 Bold\e[0m \e[2m2 Dim\e[0m \e[3m3 ???\e[0m \e[4m4 Underlined\e[0m \e[5m5 Blink\e[0m \e[6m6 ???\e[0m \e[7m7 Inverted\e[0m \e[8m8 Hidden\e[0m\n" fi 

This should size correctly for the terminal you are using. It is a little over the top for this purpose but now you can control many aspects of how this displays via parameters. Hopefully, they are all self explanatory.

Another script like the one posted by TAFKA 'goldilocks' for displaying colors which is maybe a little more practical for reference purposes:

#!/bin/bash   # These are mostly useless but you may like to play around with them to customize # the pallette. It appears that the colors cycle every 256 colors. start=${2:-0} end=${3:-255} step=${4:-1} color=$start style="48;5;" if [[ "$1" == "-f" || "$1" == "-fq" ]]; then style="38;5;" fi perLine=$(( ( $(tput cols) - 2 ) / 9 )); while [ $color -le $end ]; do printf "\e[0m \e[${style}${color}m %3d \e[0m " $color ((color+=step)) if [ $(( ( ( $color - $start ) / $step ) % $perLine )) -eq 0 ]; then printf "\n" fi done printf "\e[0m\n" if [[ "$1" != "-q" && "$1" != "-fq" ]]; then printf "\n 0 Normal \e[1m1 Bold\e[0m \e[2m2 Dim\e[0m \e[3m3 ???\e[0m \e[4m4 Underlined\e[0m \e[5m5 Blink\e[0m \e[6m6 ???\e[0m \e[7m7 Inverted\e[0m \e[8m8 Hidden\e[0m\n" fi 

This should size correctly for the terminal you are using. It is a little over the top for this purpose but now you can control many aspects of how this displays via parameters. Hopefully, they are all self explanatory.