如何在 shell 脚本中声明常量?

我无法从互联网上找到这些信息,是否有可能声明一个最终的常量变量,其值在初始化后不会改变?

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I believe you can do something like:

readonly DATA=/usr/home/data/file.dat

You can also do:

declare -r var=123
readonly FOO=bar

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In bash you can mark a variable read only by declaring it via the builtin readonly like so:

readonly CONSTVAR=value