Can this command be sent via "Send UNIX command" in ARD 3 Admin?
I tried , but received :

/bin/bash: line 1: $: command not found
/bin/bash: line 2: 7F513D02E4A8C5E2FF1C39567390ADCA: command not found
/bin/bash: line 3: $: command not found
/bin/bash: line 4: hello: command not found
/bin/bash: line 5: $: command not found

I cut and pasted the code from the Hint; perhaps that is the issue?

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Yeah, it would appear the stuff you copy/pasted is the code and the (example) responses.

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Oh, and only enter the code that is after a $, but not including the $.

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