do-yt-dlp - update script for yt-dlp

#!/bin/sh
# update script for yt-dlp v1.4

TMP=/media/ramdisk/release_$(date +%y%m%d%H%M%S%3N) # adjust TMP & BIN path to your own system specific
BIN=/home/pintcat/ubin
URL=https://github.com

CLEAN(){ # output exit message, clean up tmp data & quit
    echo $1
    rm -f "$TMP"
    exit
}

DOWNLOAD(){ # check if link is valid, prepare existing binary for backup, download new binary & make it executable
    echo "Starting download..."
    if ! wget -q --spider $URL$(grep "/yt-dlp_linux\"" "$TMP" | awk -F \" '{print $2}'); then
        echo "\033[0;31mError - download failed: $URL$(grep "yt-dlp_linux\"" "$TMP" | awk -F \" '{print $2}')\033[0m"
        return 1
    fi
    [ -e "$BIN"/yt-dlp~ ] && rm -f "$BIN"/yt-dlp~
    [ -e "$BIN"/yt-dlp ] && mv "$BIN"/yt-dlp "$BIN"/yt-dlp~
    wget -q --show-progress -O "$BIN"/yt-dlp $URL$(grep "/yt-dlp_linux\"" "$TMP" | awk -F \" '{print $2}')
    chmod +x "$BIN"/yt-dlp
}

echo "Obtaining version information..."
wget -q -O "$TMP" $URL/yt-dlp/yt-dlp/releases || CLEAN "\033[0;31mError - couldn't connect to github page $URL/yt-dlp/yt-dlp/releases\033[0m"
LATEST_VER=$(grep "/yt-dlp_linux\"" "$TMP" | awk -F / '{print $6}')
printf "Latest version: $LATEST_VER, current installed version: "
[ -x "$BIN"/yt-dlp ] && CURRENT_VER=$(yt-dlp --version) || echo "yt-dlp is not yet installed."
[ -n "$CURRENT_VER" ] && echo $CURRENT_VER.
if [ -n "$CURRENT_VER" ] && [ $CURRENT_VER = $LATEST_VER ]; then
    read -p "yt-dlp is up to date. Download anyway (y/N)? " YN
    case $YN in
        [Yy]*)
            DOWNLOAD && CLEAN Success.
            ;;
    esac
else
    DOWNLOAD && CLEAN Success.
fi
CLEAN "Nothing changed."