Bash Expect中应该转义哪些字符，以及如何转义？

我正在使用expect自动化脚本。这是我的剧本：

setup_multicraft=$(expect -c "

set timeout 10
spawn ./setup.sh

expect \"Run each Minecraft server under its own user? (Multicraft will create system users): \\\[y\\\]/n\"
send \"y\r\"

以下是一些原始脚本供参考：

Run each Minecraft server under its own user? (Multicraft will create system users): [y]/n
Run Multicraft under this user: [minecraft]
User not found. Create user 'minecraft' on start of installation? [y]/n

我知道括号、斜线、有时点等字符需要转义才能正常工作。但是，我在角色上尝试了几种转义序列组合，每次都会出现以下错误：

invalid command name "y\"
    while executing
"y\\"
    invoked from within
"expect "Run each Minecraft server under its own user? (Multicraft will create system users): \\[y\\]/n""
spawn ./setup.sh

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谢谢你的阅读

您在shell中用双引号字符串声明expect脚本的方式是您的主要痛苦来源。如果不依赖于插值外壳变量，则可以使用一个单引号：

setup_multicraft=$(expect <<'END_OF_EXPECT'

    set timeout 10
    spawn ./setup.sh

    expect {Run each Minecraft server under its own user? (Multicraft will create system users): [y]/n}
    send "y\r"

    # ...
END_OF_EXPECT
)

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setup\u multicraft=$（如果我需要使用shell变量，我是否能够以某种方式将其转义为使用shell变量？