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Update bash.md
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bash.md

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@@ -23,5 +23,6 @@ function wait_for_port() {
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# see my login-shell is doing
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```BASH
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PS4='+ $BASH_SOURCE:$LINENO:' BASH_XTRACEFD=1 bash -xlic ""
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PS4='+ $BASH_SOURCE:$LINENO:' BASH_XTRACEFD=7 bash -xlic "" 7>trace.log
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less trace.log
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```

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