Как скачать видео с YouTube из командной строки

#!/bin/sh
 
if  (("${#}" <= "1")) ;
then
   {
   echo "example: ${0} youtube_url";
   echo "or example: ${0} youtube_url filename.flv";
   exit 1;
   }
fi
 
 
BASEURL="http://youtube.com/get_video.php?";
ORIGURL="${1}";
TMPFILE="$(mktemp)";
 
echo " + search file name...";
wget -q -c -O "${TMPFILE}" "${ORIGURL}";
if &#91; "${?}" != "0" &#93;;
then
    {
    echo " - Error";
    exit 1;
    }
fi
 
TITLE=$(cat ${TMPFILE} | grep '&title=' | sed -e 's/.*title=//g' | sed -e "s/'.*//g");
T=$(cat ${TMPFILE} | grep 'video_id' | grep '&t=' | sed -e 's/.*\&t=//g' | sed -e 's/\&.*//');
V=$(echo ${ORIGURL} | sed -e 's/.*\?v\=//g' | sed -e 's/\&.*//g');
rm "${TMPFILE}" &> /dev/null;
 
 
if &#91; "${2}" != "" &#93;;
then
    {
    echo "Manual naming.";
    echo " + download file \"${2}\"...";
    wget -q -c -S -O "${2}.flv" "${BASEURL}video_id=${V}&t=${T}";
    }
else
    {
    echo "Auto naming";
    echo " + download file \"${TITLE}\"...";
    wget -q -c -S -O "${TITLE}.flv" "${BASEURL}video_id=${V}&t=${T}";
    }