如果声明，不能在bash中'sudo'

Question

我有双linux启动我是bash的新手

当运行以下脚本时我得到了奇怪的错误：

if [[ 'grep -i fedora /etc/issue' ]]; then
        echo "the OS is Fedora"
        $(sudo yum update -y && sudo yum upgrade -y)
else
        echo "the OS is Ubuntu"
        $(sudo apt-get update && sudo apt-get upgrade -y && sudo apt-get dist-upgrade -y)
fi

错误：./ server_update.sh：第9行：已加载：未找到命令

Answer 1

它试图执行apt-get / yum命令的输出，丢失$(..)

您在开始时也遇到问题：

if [[ -n "$(grep -i fedora /etc/issue)" ]]; then

是检查字符串是否存在的正确方法。

您的代码应如下所示：

if [[ -n "$(grep -i fedora /etc/issue)" ]]; then
    echo "the OS is Fedora"
    sudo yum update -y && sudo yum upgrade -y
else
    echo "the OS is Ubuntu"
    sudo apt-get update && sudo apt-get upgrade -y && sudo apt-get dist-upgrade -y
fi