Download a file using the current connection and a proxy at the same time

downloadmultiple.bash

#!/bin/bash

# Variables
regex='(https?|ftp|file)://[-A-Za-z0-9\+&@#/%?=~_|!:,.;]*[-A-Za-z0-9\+&@#/%=~_|]'
percentDownloadedFromSecondProxy=35
filename=$(basename "$1")
filesize=$(curl -sI $1 | tr -d '\r' | sed -En 's/^Content-Length: (.*)/\1/p')
onepart=$(echo $[ $filesize * 35 /100 ])
secondpart=$(echo $[ $onepart + 1 ])
proxyurl="socks5://192.168.100.89:1080"

# Check if an URL is provided
if [[ $1 =~ $regex ]]
then 
    echo "Link valid, downloading..."
else
    echo "Link not valid"
    exit 0
fi

# Progress Bar function
function ProgressBar {
        let _progress=(${1}*100/${2}*100)/100
        let _done=(${_progress}*4)/10
        let _left=40-$_done
        _done=$(printf "%${_done}s")
        _left=$(printf "%${_left}s")

printf "\rProgress : [${_done// /#}${_left// /-}] ${_progress}%%"
}

# Download the file
curl -s -x $proxyurl --range 0-$onepart -o $filename.part1 $1 &
curl -s --range $secondpart- -o $filename.part2 $1 &

# Wait a bit to let curl creating the file
sleep 1s

# Show progress bar
while /usr/bin/pgrep curl >/dev/null; do
    sleep 0.1
    currentSizePart1=$(stat --printf="%s" $filename.part1)
    currentSizePart2=$(stat --printf="%s" $filename.part2)
    currentSizeTotal=$(echo $[ 100 * ($currentSizePart1 + currentSizePart2) / $filesize ])
    ProgressBar $currentSizeTotal 100
done

# Cleanup
cat $filename.part* > $filename
rm $filename.part*

echo -e "\nDownload finished!"