bash-tips

(){
    local software=("vim" "git" "tmux" "npm")   
    for soft in ${software[@]}
    do
        type $soft 2>&1 > /dev/null     # 已安装，则返回零
        if [ $? -ne 0 ]; then
            echo "ERROR: **$soft** is not installed!"
            exit 1
        fi
        echo "Checking $soft...ok!"
    done
}

check_software