Fix bash command

[zssz]

No description provided.

[google-oss-robot]

Hi @zssz. Thanks for your PR.

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[icco]

I mean this is fine... but why though? Could you follow our pull request template to explain why this change is needed? It's functionally equivalent and just a matter of style afaik.

/hold
/Ok-to-test

[sethvargo]

echo isn't the same on all systems. My guess they are running a version that doesn't support heredocs.

/unhold
/lgtm

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