How to echo a variable containing an unescaped dollar sign in bash

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The problem is that script receives “test1” in the first place and it cannot possibly know that there was a reference to an empty (undeclared) variable. You have to escape the $ before passing it to the script, like this:

./script.sh "test1\$test2"

Or use single quotes ' like this:

./script.sh 'test1$test2'

In which case bash will not expand variables from that parameter string.

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