Bash命令引用问题 [英] Bash command quoting issue

问题描述

我有一个奇怪的问题，我不明白为什么会这样.对于任何bash忍者来说，这都是小菜一碟.

I have this weird issue, I can't understand why is happening. It should be a piece of cake for any bash ninja.

OPTIONS="-auto -batch -ignore 'Path one' -ignore 'Path two' -ignore 'Path three'"
unison $OPTIONS a b

我希望将其翻译为...

I expected this to be translated as...

unison -auto -batch -ignore 'Path one' -ignore 'Path two' -ignore 'Path three' a b

...然后工作.但事实并非如此.当运行完整的命令时，我没有问题，可以统一使用.但是，当我运行命令unison $OPTIONS a b时，一致抱怨:

...and just work. But it doesn't. When running the full command, I have no problems, unison is ok with that. But when I run the command unison $OPTIONS a b, unison complains:

Usage: unison [options]
    or unison root1 root2 [options]
    or unison profilename [options]

For a list of options, type "unison -help".
For a tutorial on basic usage, type "unison -doc tutorial".
For other documentation, type "unison -doc topics".

unison was invoked incorrectly (too many roots)

我在做什么错了?

推荐答案

BASH常见问题解答条目50:"I正在尝试将命令放入变量中，但复杂的情况总是会失败！"

BASH FAQ entry #50: "I'm trying to put a command in a variable, but the complex cases always fail!"

options=(-auto -batch -ignore 'Path one' ...)
unison "${options[@]}" a b

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