wwdc2014.sh

#!/bin/bash

############################################################################
# Automated WWDC 2014 videos downloader script
# Cristian Grau @SaroFR
# Based on Krzysztof Zablocki's (@merowing_) Download HD WWDC 2014 command
############################################################################

function download {
        curl --silent --remote-name $1
	echo $1 | grep SD > /dev/null
	if [ $? -eq 0 ]; then
		if [ -f `echo $1 | cut -d "/" -f9` ]; then
			echo -e "[\033[38;5;40mSUCCESS\033[39m]"
		else
			echo -e "[\033[38;5;196mFAILED\033[39m]"
		fi
        fi
}


function downloadHD {
	echo -n "-> Downloading $1... "
	download $1	

	if [ ! -f `echo $1 | cut -d "/" -f9` ]; then
		echo -e "[\033[38;5;196mFAILED\033[39m]"
		echo -en "\t-> Downloading SD version... "
		SDfile=`echo $remotefile | sed 's/HD/SD/' | sed 's/hd/sd/'`
		download $SDfile
	else
		echo -e "[\033[38;5;40mSUCCESS\033[39m]"
	fi
}

function downloadPDF {
	echo -n "-> Downloading $1..."
	curl --silent --remote-name $1
	
	if [ -f `echo $1 | cut -d "/" -f9` ]; then
		echo -e "[\033[38;5;40mSUCCESS\033[39m]"
	else
		echo -e "[\033[38;5;196mFAILED\033[39m]"
	fi
}

echo -n "-> Checking available videos... "
files=`curl --silent https://developer.apple.com/videos/wwdc/2014/ | grep -iIoh 'http.*._hd_.*dl=1">HD' | sed -e 's/\?dl=1">HD//g'`
echo "Found `echo $files | tr " " "\n" | wc -l |tr -d " "` "

for remotefile in `echo $files | sed 's/’//' | tr " " "\n"`
do
	filename=`echo $remotefile | cut -d "/" -f9`
	echo -n "-> Checking $filename... "
	remotesize=`curl -sI $remotefile | grep "Content-Length" | cut -d" " -f2 | sed 's/.$//'`

	if [ -f $filename ] ; then
		localsize=`ls -la $filename | tr -s " " | cut -d" " -f5`
		
		if [ $remotesize != $localsize ]; then
			echo -e "[\033[38;5;196mSIZE DOESN'T MATCH\033[39m]"
			downloadHD $remotefile
		else
			echo -e "[\033[38;5;40mEXISTS\033[39m]"
		fi
	else
		echo -e "[\033[38;5;196mDOESN'T EXIST\033[39m]"
		filename=`echo $filename | sed 's/hd/sd/'`
		echo -en "\t-> Checking SD version... "

		if [ -f $filename ]; then
			localsize=`ls -la $filename | tr -s " " | cut -d" " -f5`
			remotefile=`echo $remotefile | sed 's/HD/SD/' | sed 's/hd/sd/'`
			remotesize=`curl -sI $remotefile | grep "Content-Length" | cut -d" " -f2 | sed 's/.$//'`
		
			if [ $remotesize != $localsize ]; then
				echo -e "[\033[38;5;196mSIZE DOESN'T MATCH\033[39m]"
				echo -n "-> Downloading $remotefile... "
				download $remotefile
			else
				echo -e "[\033[38;5;40mEXISTS\033[39m]"
			fi
		else
			echo -e "[\033[38;5;196mDOESN'T EXIST\033[39m]"
			downloadHD $remotefile
		fi
	fi 
	
		remotePDFfile=`echo $remotefile | sed -E 's/(hd|sd)_//g' | sed 's/mov/pdf/'`
	
	if [ ! -f `echo $remotePDFfile | cut -d "/" -f9` ]; then
		downloadPDF $remotePDFfile
	fi
done

I prefer to remove all silent option from code. It's easier to see how much time is to end downloading one curse.