Tcl/Tk - Expect Processes

Expect Processes - Tcl/Tk module T212

Expect can be used to control multiple connections at the same time Ð a useful facility if it's connecting to processes that take a long elapsed time to run. In this module, you'll learn how to control multiple processes, never an easy task, but much easier with Expect than with other languages!

This topic is presented on public course Tcl Basics

Examples from our training material

botget	parallel expect example - get robots.txt from several servers
exp_ping	expect - multiple parallel pings, Red Hat Linux version
livetest.exp	Web based script - ping a series of remote hosts
mex	multiple processes through expect
osx_tkpingle	Checking which machines are online - Mac OSX
pingle	parallel pings - Caldera Linux version
server.tce	Expect script, web server, CGI
tkpingle	Checking network continuity using ping, Expect and a Tk GUI

More web pages on this subject

Testing our servers via a webadmin page

Specialist books

Opentalk forum discussions related to this topic

source spawn proc expect got me
expect on a socket
expect expect before and expect after
expect and multiple processes
Web Front TCL Expect Telnet Backend
Problem with expect spawn on Linux

Pictures

Expect can handle multiple parallel processes

Background information

Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from http://www.training-notes.co.uk.

Topics covered in this module

Multiple processes.
Spawn id s.
Expecting from multiple processes.
Adding Tk as well.
A few words of caution.
Expect on a Web server.

Complete learning

If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

Well House Consultants specialise in training courses in Tcl/Tk, Expect,Python, Perl, PHP, and MySQL. We run Private Courses throughout the UK (and beyond for longer courses), and Public Courses at our training centre in Melksham, Wiltshire, England. It's surprisingly cost effective to come on our public courses - even if you live in a different country or continent to us.

We have a technical library of over 600 books on the subjects on which we teach. These books are available for reference at our training centre. Also available is the Opentalk Forum for discussion of technical questions.