Esse script permite utilizar tags para formata a saída de texto no terminal.
Verifique o código para ver todas as tags disponíveis.

Utilização:
# Importa a função.
. lib-simple-tags

# Exemplo 1
cat <<EOF | simple-tags
[b]Bold[/b]
[i]Italic[/i]
[u]Underline[/u]
Normal [negative]Negativo[/negative] Normal
[red]Vermelho[reset]
[red][#white]Vermelho fundo branco[reset]
[blink]Piscando[/blink]
[reset]
EOF

# Exemplo 2
simple-tags "[strike]Traçado[/strike]"

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Esconder código-fonte

#!/bin/bash

function simple-tags( )
{

   # Tabela de substituição das tags ( ECMA-48 ).
   local tags_table
   tags_table=$( cat <<-EOF 
      "[reset]"               "\\e[0m"
      "[b]"                  "\\e[1m"
      "[bold]"               "\\e[1m"
      "[faint]"               "\\e[2m"
      "[i]"                  "\\e[3m"
      "[italic]"               "\\e[3m"
      "[u]"                  "\\e[4m"
      "[underline]"            "\\e[4m"
      "[blink]"               "\\e[5m"
      "[fast-blink]"            "\\e[6m"
      "[negative]"            "\\e[7m"
      "[hidden]"               "\\e[8m"
      "[strike]"               "\\e[9m"
      "[primary-font]"         "\\e[10m"
      "[default-font]"         "\\e[10m"
      "[font-1]"               "\\e[11m"
      "[font-2]"               "\\e[12m"
      "[font-3]"               "\\e[13m"
      "[font-4]"               "\\e[14m"
      "[font-5]"               "\\e[15m"
      "[font-6]"               "\\e[16m"
      "[font-7]"               "\\e[17m"
      "[font-8]"               "\\e[18m"
      "[font-9]"               "\\e[19m"
      "[fraktur]"               "\\e[20m"
      "[du]"                  "\\e[21m"
      "[double-underline]"      "\\e[21m"
      "[/b]"                  "\\e[22m"
      "[/bold]"               "\\e[22m"
      "[/faint]"               "\\e[22m"
      "[/i]"                  "\\e[23m"
      "[/italic]"               "\\e[23m"
      "[/fraktur]"            "\\e[23m"
      "[/u]"                  "\\e[24m"
      "[/underline]"            "\\e[24m"
      "[/du]"                  "\\e[24m"
      "[/double-underline]"      "\\e[24m"
      "[/blink]"               "\\e[25m"
      "[/negative]"            "\\e[27m"
      "[/hidden]"               "\\e[28m"
      "[/strike]"               "\\e[29m"
      "[black]"               "\\e[30m"
      "[red]"                  "\\e[31m"
      "[green]"               "\\e[32m"
      "[yellow]"               "\\e[33m"
      "[blue]"               "\\e[34m"
      "[magenta]"               "\\e[35m"
      "[cyan]"               "\\e[36m"
      "[white]"               "\\e[37m"
      "[custom-color]"         "\\e[38m"
      "[default-color]"         "\\e[39m"
      "[#black]"               "\\e[40m"
      "[#red]"               "\\e[41m"
      "[#green]"               "\\e[42m"
      "[#yellow]"               "\\e[43m"
      "[#blue]"               "\\e[44m"
      "[#magenta]"            "\\e[45m"
      "[#cyan]"               "\\e[46m"
      "[#white]"               "\\e[47m"
      "[#custom-color"         "\\e[48m"
      "[#default-color]"         "\\e[49m"
      "[br]"         "\\n"
      EOF
   )

   # Troca as tags pelos códigos do terminal.
   function replace-tags()
   {
      # Dados de entrada.
      local result=$*

      while IFS=$'\t' read -r str_from str_to;
      do

         str_from=${str_from//\"/}
         str_to=${str_to//\"/}
         result=${result//"$str_from"/"$str_to"}

      done <<< "$tags_table"
      
      echo -e "$result"

   }


   # Lê a entrada de dados.
   local result=$*
   if [[ "$#" -ge 1 ]];
   then
      replace-tags "$*"
   else
      while read -r line;
      do
         replace-tags "$line"
      done
   fi

}

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