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Full Discussion: expect - How to ignore empty lines?
Top Forums Shell Programming and Scripting expect - How to ignore empty lines? Post 302383083 by whbos on Monday 28th of December 2009 09:31:20 AM
Old 12-28-2009
expect - How to ignore empty lines?
Hi all,

I'm looking for a way to generate an error when a command does not print an expected message. For example :

test.sh :
Code:
echo hi!

test.exp :
Code:
exp_internal 1
spawn ./test.sh
expect {
  "hi!" {puts "bingo!"}
  "*" {puts "error!" ; exit 1}
}

I expected test.exp to match the string "hi!" but it turns out that an empty string is matched first (printed in blue) :

Code:
spawn ./test.sh
parent: waiting for sync byte
parent: telling child to go ahead
parent: now unsynchronized from child
spawn: returns {2650126}

 expect: does "" (spawn_id exp4) match glob pattern "hi!"? no
"*"? yes
expect: set expect_out(0,string) ""
expect: set expect_out(spawn_id) "exp4"
expect: set expect_out(buffer) ""
error!

I tried some alternatives like first clearing the expect buffer with `expect "*"` or matching it with `expect ""`, etc. but the empty string is not deleted. Any suggestions?

Regards,
Willem.
Last edited by whbos; 12-28-2009 at 11:17 AM..
 

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LEARN ABOUT DEBIAN

bb-services

BB-SERVICES(5)							File Formats Manual						    BB-SERVICES(5)

NAME

       bb-services - Configuration of TCP network services

SYNOPSIS

       $BBHOME/etc/bb-services

DESCRIPTION

       bb-services contains definitions of how bbtest-net(1) should test a TCP-based network service (i.e. all common network services except HTTP
       and DNS).  For each service, a simple dialogue can be defined to check that the service is functioning normally, and optional flags  deter-
       mine if the service has e.g. a banner or requires SSL- or telnet-style handshaking to be tested.

FILE FORMAT

       bb-services is a text file. A simple service definition for the SMTP service would be this:

	  [smtp]
	     send "mail
quit
"
	     expect "220"
	     options banner

       This  defines  a service called "smtp". When the connection is first established, bbtest-net will send the string "mail
quit
" to the
       service. It will then expect a response beginning with "220".  Any data returned by the service (a so-called "banner") will be recorded and
       included in the status message.

       The full set of commands available for the bb-services file are:

       [NAME] Define  the  name  of  the  TCP service, which will also be the column-name in the resulting display on the test status. If multiple
	      tests share a common definition (e.g. ssh, ssh1 and ssh2 are tested identically), you may list these in a  single  "[ssh|ssh1|ssh2]"
	      definition, separating each service-name with a pipe-sign.

       send STRING

       expect STRING
	      Defines the strings to send to the service after a connection is established, and the response that is expected. Either of these may
	      be omitted, in which case bbtest-net(1) will simply not send any data, or match a response against anything.

	      The send- and expect-strings use standard escaping for non-printable characters. "
" represents a carriage-return (ASCII 13),  "
"
	      represents  a  line-feed	(ASCII 10), "	" represents a TAB (ASCII 8).  Binary data is input as "xNN" with NN being the hexadecimal
	      value of the byte.

       port NUMBER
	      Define the default TCP port-number for this service. If no portnumber is defined, bbtest-net(1) will attempt to lookup the  portnum-
	      ber in the standard /etc/services file.

       options option1[,option2][,option3]
	      Defines test options. The possible options are
		 banner - include received data in the status message
		 ssl - service uses SSL so perform an SSL handshake
		 telnet - service is telnet, so exchange telnet options

FILES

       $BBHOME/etc/bb-services

SEE ALSO

       bbtest-net(1)

Xymon							    Version 4.2.3:  4 Feb 2009						    BB-SERVICES(5)
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