How to request variable for Powershell / Bash Task group

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I have tried to automate a group of pipelines and makes them independent from specifying variables. So everything should be based on convention.

But, i failed to deduce everything based on Build.DefinitionName, for example.

The biggest issue, is to pass specific variable (based on names) to Powershell script.

The script can request for variables by specifying the following:

$(myVariable)

but i can't feed them using expression :(

It's the same for bash script.

Hope this helps !