mlibbey commented on code in PR #12286:
URL: https://github.com/apache/trafficserver/pull/12286#discussion_r2145896679


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tools/hrw4u/bootstrap.sh:
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@@ -20,12 +20,22 @@ set -e
 
 VENV_NAME="hrw4u"
 
+if ! which antlr; then

Review Comment:
   I got the
   if ! command; from
   https://www.shellcheck.net/ -- the PR passes shellcheck without issues. When 
I replace `which antlr` with `which sldkjcdslkfjsdlfkj` I get the echos.



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