CODEWITHSUNDEEP
bashshellexpect
paul
paul

Reputation: 1242

Ignore Bash Trace in expect

I am try to write regression tests using expect for an interactive bash script.

So far everything works Ok. I spawn the process with the correct arguments, and then send/expect.

I would like, during tests, to enable tracing in the bash script, using the set -x command. However, when doing so, the bash trace output messes with expect.

I would like expect to ignore those lines when performing matching but still output them on either stdout or stderr.

Apperently, there is so way to treat stderr and stdout independently.

I have already tried a few thing using expect_before and expect_background, but none having given me good results.

Any thoughts ?

Thanks.

Upvotes: 0

Views: 207

Answers (1)

Alexander L. Belikoff
Alexander L. Belikoff

Reputation: 5721

If the output (I mean non-trace output) from your bash script if well-defined, you can simply ignore the trace output when using expect command. For example, if your script shows:

+ echo 'Password:'
Password:

you can use regexp mode of expect:

expect -re '^Password:'

That would ignore the trace output but match the password prompt. Granted, your match rules should be very tight to not match any undesirable output.

Upvotes: 0

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