I am running Expect in the verbose mode, so I would expect to see any errors spew on the screen.

Assuming a bourne-ish shell, the error code returned is present in its $? variable. You'll need to output its contents. (To be clear, I don't mean Perl's similar $? variable.)

...Then again, my kill is quite noisy when it fails. 

$ kill -INT 21161
bash: kill: (21161) - Operation not permitted

$ echo $?
1

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In reply to Re^5: Kill sent from perl expect not working by ikegami
in thread Kill sent from perl expect not working by druidmatrix

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