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Are there any standards regarding double quoted shell strings? I'd like to know details such as in what exact contexts is $ supposed to be interpreted literally, what exact patterns are $ variables supposed to match, and if anything other than $variables, ${variables}, backtick blocks, and $(process substitution blocks) is supposed to be handled specially.

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You did not specify in what shell you are interested. The answer is based on the assumption that you are asking about Bash. When man bash is not enough:

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