Show reference entities via BASH/Zenity

#! /bin/bash

# A way to quickly call up those HTML entity conversions you don't need often.
# call by refent.sh [SECTION]
# this refers to refent.txt which is here:  http://pastebin.com/fTs9vpJs

section=$(echo "${1^^}")
case "$section" in
    "GR"*) cat /home/refent.txt | sed -e '/./{H;$!d;}' -e 'x;/GREEK/!d;' | zenity --text-info --width 400 --height 400 --title="$1" ;;
    "SYM"*) cat /home/refent.txt | sed -e '/./{H;$!d;}' -e 'x;/SYMBOL/!d;' | column  -c 2 | zenity --text-info --width 400 --height 400 --title="$1" ;;
    "ACC"*) cat /home/refent.txt | sed -e '/./{H;$!d;}' -e 'x;/ACCENTS/!d;' | zenity --text-info --width 400 --height 400 --title="$1" ;;
    "MA"*) cat /home/refent.txt | sed -e '/./{H;$!d;}' -e 'x;/MATHS/!d;' | column -c 2 | zenity --text-info --width 400 --height 400 --title="$1" ;;
    "*") echo "You need to choose an appropriate section" ;;
esac