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manual page missing ${parameter-replacement}

From: Ulrich Windl
Subject: manual page missing ${parameter-replacement}
Date: Mon, 21 Nov 2022 08:20:51 +0100

I think the bash manual page lacks some important detail of parameter 
substitution, namely:
"Bash tests for a parameter that is unset or null. Omitting the colon results 
in a test only for a parameter that is unset."

(found in 

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