search urban dictionary for definition using bash

urban-dictionary.sh

#!/usr/bin/env bash

function command_exists () {
    type "$1" &> /dev/null ;
}

function print_error() {
    printf "\e[31m Error \e[0m: %s \n" "$1" 
}

# Check that required tools are installed
if ! command_exists lynx; then
    print_error "you need lynx to run this program. please visit: http://lynx.browser.org/"  
    exit 1  
fi

if ! command_exists hxnormalize || ! command_exists hxselect; then
    print_error "you need html-xml-utils to run this program. please visit http://packages.ubuntu.com/trusty/text/html-xml-utils"  
    exit 1  
fi

# Check parameter
if [[  $# -eq 0 ]]; then
    print_error "usage: $0 \"<term to find>\""  
    exit 1  
fi
content=$(wget -O - -q "http://www.urbandictionary.com/define.php?term=$1" |
        hxnormalize -x 2>/dev/null |
        hxselect -i 'div.def-panel:first-child')

meaning=$(echo "${content}" | hxselect -i "div.meaning")
example=$(echo "${content}" | hxselect -i "div.example")
topDefinition=$(printf "\n%s%s%s\n" \
"<hr /><div>searching for: $1</div>" \
"<div>Meaning</div>${meaning}" \
"<div>Examples</div>${example}<hr />")  

printf "\n"
echo ${topDefinition} | lynx -dump -stdin
printf "\n"