check URLs in a file and get HTTP status code

checkurls.sh

#!/bin/bash
# -----------------------
# |###| version 1.3.1
# |###| Rex Tsou
# |###| 2017/09/26
# usage------------------
# $ ./checkurls.sh [file]
# -----------------------
output_file='url_status.md'

# colorful echo
colorDefault='\033[0m'
colorRevert='\033[7m'

grep -Eo '(http|https)://[^" ]+' < $1 >> "~tmp${output_file}"

urlLen=$(wc -l < "~tmp${output_file}") # get count of URLs
urlCurrent=0
echo "There are ${urlLen} URLs in $1"
echo "Starting to check.."

echo '' >> $output_file
echo `date` >> $output_file
echo $1 	>> $output_file
echo '----' >> $output_file

while IFS= read url || [[ -n "$url" ]];
do
    echo -ne "${revertColor}[ $((++urlCurrent))/${urlLen} ]${noColor}"\\r # show progress

    url=${url%$'\r'} # trim CR(\r) at the end
    urlstatus=$(curl --output /dev/null --silent --head --write-out '%{http_code}\n' "$url")
    if   [[ $urlstatus =~ ^000$ ]] ; then  # Regular Expression check http status code
    	echo "$url  __"$urlstatus"__  No valid HTTP response <<<<<" >> $output_file
    elif [[ $urlstatus =~ ^3..$ ]] ; then
    	echo "$url  __"$urlstatus"__  Redirection" 	>> $output_file
    elif [[ $urlstatus =~ ^4..$ ]] ; then
    	echo "$url  __"$urlstatus"__  Client Error <<<<<" >> $output_file
    elif [[ $urlstatus =~ ^5..$ ]] ; then
    	echo "$url  __"$urlstatus"__  Server Error <<<<<" >> $output_file
    else
    	echo "$url  __"$urlstatus"__" >> $output_file
    fi
done < "~tmp${output_file}"
echo '----' >> $output_file
rm "~tmp${output_file}"