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Full Discussion: Expect return code
Top Forums UNIX for Beginners Questions & Answers Expect return code Post 303013166 by drysdalk on Friday 16th of February 2018 06:49:57 AM
Old 02-16-2018
Hi,

I think the problem here (though I'm far from an expect expert, or indeed a regular user of it) is that the $? variable is a bash feature, and not an expect one. That's not how you capture exit values in expect.

So what's actually happening here is that your variable retcode is becoming equal to, quite literally, the string $?. And that's why your comparison fails later on.

I believe to capture exit values in expect you have to use the wait command to hang about and wait for your sent command to exit, and to capture information relating to how it exited, including among other things its exit value. You could then do a comparison on the information obtained by wait (the fourth value returned by it is I believe the exit value of the last process executed) and do your check that way.

Hope this helps.
 

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LEARN ABOUT NETBSD

wait

WAIT(1) 						    BSD General Commands Manual 						   WAIT(1)

NAME

     wait -- await process completion

SYNOPSIS

     wait [pid]

DESCRIPTION

     If invoked with no arguments, the wait utility waits until all existing child processes in the background have terminated.

     Available operands:

     pid     If a pid operand is specified, and it is the process ID of a background child process that still exists, the wait utility waits until
	     that process has completed and consumes its status information, without consuming the status information of any other process.

	     If a pid operand is specified that is not the process ID of a child background process that still exists, wait exits without waiting
	     for any processes to complete.

     The wait utility exits with one of the following values:

     0	     The wait utility was invoked with no operands and all of the existing background child processes have terminated, or the process
	     specified by the pid operand exited normally with 0 as its exit status.

     >0      The specified process did not exist and its exit status information was not available, or the specified process existed or its exit
	     status information was available, and it terminated with a non-zero exit status.

     If the specified process terminated abnormally due to the receipt of a signal, the exit status information of wait contains that termination
     status as well.

STANDARDS

     The wait command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BSD
								   June 5, 1993 							       BSD
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