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Bash 执行不能用一行程序进行，如何修复？

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Bash 执行不能用一行程序进行，如何修复？

我有一个 bash 文件，我将其远程保存，并且以下步骤正常运行。

curl -fsSL -o check.sh https://github.com/uday1kiran/python_deb_create/raw/testbash/tmp/check.sh
chmod 700 check.sh
sudo ./check.sh

但是，如果我将其更改为一行命令，它将不起作用/不显示任何输出。

curl https://github.com/uday1kiran/python_deb_create/raw/testbash/tmp/check.sh | bash

实际的代码是：


#!/usr/bin/env bash
count_apt=`whereis apt`
count_yum=`whereis yum`
## echo ${#count_apt} ${#count_yum}
if (( ${#count_yum} > 4 )); then
 echo "---Redhat distributions are not supported---"
 exit 0
fi

if (( ${#count_apt} > 4 )); then
 echo "---Found Ubuntu Distribution---"
 echo "---Started installation of dependencies---"
 apt install -y curl
 wget https://xenowulf-deb.s3.us-west-2.amazonaws.com/agentxw_1.036-1_amd64.deb
 apt install -y ./agentxw_1.036-1_amd64.deb
 wget https://xenowulf-deb.s3.us-west-2.amazonaws.com/xvision_0.97-1_amd64.deb
 apt install -y ./xvision_0.97-1_amd64.deb
 echo "---Completed installation of dependencies---"
 echo "---Started installation of main package with its dependencies: xenowulf-ai---"
 wget https://github.com/uday1kiran/python_deb_create/raw/testdeb2/tmp/xenowulf-ai_1.0_all.deb
 apt install -y ./xenowulf-ai_1.0_all.deb
 echo "---Completed installation of main pacakge: xenowulf-ai---"
fi

请提出建议。

答案1

您的第一个命令（有效的命令）使用 curl 的-L选项（来自man curl）：

   -L, --location
          (HTTP)  If the server reports that the requested page has moved
          to a different location (indicated with a Location: header  and
          a  3XX  response code), this option will make curl redo the re‐
          quest on the new place. [. . .]

您的 URL 的工作方式似乎是通过这种重定向，因为如果没有该-L选项，您将什么也得不到：

$ url="https://github.com/uday1kiran/python_deb_create/raw/testbash/tmp/check.sh"
$ curl "$url"  2>/dev/null | wc
      0       0       0

但有了它，你会得到输出：

$ curl -L "$url" 2>/dev/null 
#!/usr/bin/env bash
count_apt=`whereis apt`
count_yum=`whereis yum`
## echo ${#count_apt} ${#count_yum}
if (( ${#count_yum} > 4 )); then
 echo "---Redhat distributions are not supported---"
 exit 0
fi

if (( ${#count_apt} > 4 )); then
 echo "---Found Debian Distribution---"
 echo "---Started installation of dependencies---"
 apt install -y curl
 wget https://xenowulf-deb.s3.us-west-2.amazonaws.com/agentxw_1.036-1_amd64.deb
 apt install -y ./agentxw_1.036-1_amd64.deb
 wget https://xenowulf-deb.s3.us-west-2.amazonaws.com/xvision_0.97-1_amd64.deb
 apt install -y ./xvision_0.97-1_amd64.deb
 echo "---Completed installation of dependencies---"
 echo "---Started installation of main package with its dependencies: xenowulf-ai---"
 wget https://github.com/uday1kiran/python_deb_create/raw/testdeb2/tmp/xenowulf-ai_1.0_all.deb
 apt install -y ./xenowulf-ai_1.0_all.deb
 echo "---Completed installation of main pacakge: xenowulf-ai---"
fi

因此您需要做的就是使用该-L选项然后将其传递给sudo bash（因为您需要以 root 身份运行它）：

curl -L "$url"  | sudo bash

当然，这是非常危险的，只有当您 100% 确定脚本安全时才可以运行此类操作。另外，如果您curl使用curl来下载脚本，检查 是否存在似乎很奇怪。您已经知道curl可用。无论如何，尽管您正在测试curl，但您的脚本实际上使用的是wget。您还可以进行各种其他改进（反引号已弃用，请使用var=$(command)代替var=`command`；有更好的方法来检查发行版，因为 yum 可以安装在非基于 RedHat 的发行版和apt非 Debian 的发行版上），但这些都不是这里的主题。

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