Fix: Use grep directly

[localheinz]

This pull request

• uses grep directly

Fixes #5598.

💁‍♂️ For reference, see https://stackoverflow.com/questions/49664991/why-am-i-getting-cat-write-error-broken-pipe-rarely-and-not-always.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (d62e419) to head (33e1cac).

❗ Current head 33e1cac differs from pull request most recent head d5e69d7. Consider uploading reports for the commit d5e69d7 to get more accurate results

Additional details and impacted files

@@     Coverage Diff     @@
##   8.5   #5724   +/-   ##
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