Nodejs: detect and install the NPM module. If it is already installed, skip

CURTIME=$(date "+%Y-%m-%d %H:%M:%S")

checkAndInstall(){
    #  Determine whether it exists 
    # ps -ef|grep node |wc -l
    # echo [email protected]
    echo 'check and install npm modular：'$1
    COUNT=$(ps -ef|grep $1 |wc -l)
    if [ $COUNT -eq 1 ]; then
        echo "$CURTIME $1 exist"
        echo "$CURTIME $1 exist" >> /tmp/update_npm_log.txt
    else
        npm install $1
        echo "$CURTIME $1 installing"
        echo "$CURTIME $1 installed" >> /tmp/update_npm_log.txt
    fi
}

n v14.16.0
npm config set registry https://registry.npm.taobao.org
cd /home/opc/web-core
# npm install nodemailer
# ----------------------------------
checkAndInstall generic-pool
echo $?