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Advanced Programming in Expect:
A Bulletproof Interface

Using The send_expect Procedure

Once the interface has been initialized using send_expect_init, and a process has been spawned, it is ready to be used with the syntax:

send_expect id command;
where 
id = the spawn id of the session on which to send the command, and 
command = the entire command string including the terminating carriage-return, if any. 
This syntax, and the implementation of the expression-action lists, support multiple-session applications. 

The examples provided in this article are simple examples but with more attention to detail, and where warranted a complete implementation is provided as an example.  The send_expect procedure usually replaces only two lines of code in an existing system.

The full syntax for properly using the interface is actually:

  if { [send_expect $id $command] != 0} {
   ## handle your error here
  }


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Introduction

Setting Up The Interface
Using The send_expect Procedure
How It Works
Moving Window Snapshot Diagnostics
Controlling The Behavior Of The Interface
Failures
 

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