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Checking which machines are online - Mac OSX
Expect Processes example from a Well House Consultants training course
More on Expect Processes [link]
Source code: osx_tkpingle Module: T212
#!/usr/bin/env wish
package require Expect # check a number of systems for signs of life at the same time # expect + tk - checking multiple hosts graphically by ping # Due to differing ping utilities, this script varies depending # on the system on which it is run. This one is for Mac OS X if {[llength $argv] < 1} { set argv {localhost www.wellho.net www.sheepbingo.co.uk www.wellhousemanor.co.uk 192.168.200.67 } } set high [expr [llength $argv] * 40 + 80] wm geometry . 200x$high foreach system $argv { set syslab [regsub -all {\.} $system "_"] label .la_$syslab -text $system -background salmon pack .la_$syslab -fill both -expand true -padx 5 -pady 5 } . config -background white button .quit -text quit -command exit button .redo -text "Run tests" -command { log_user 0 set timeout 60 set runningcount 0 # spawn out a series of pings foreach system $argv { spawn ping -c 3 $system set id($system) $spawn_id set backlook($spawn_id) $system set good($system) 0 lappend idlist $id($system) set syslab [regsub -all {\.} $system "_"] .la_$syslab config -background red incr runningcount } # gather up a series of responses while {$runningcount > 0} { expect { -i $idlist "\n" { set which $expect_out(spawn_id) lappend ans($which) $expect_out(buffer) set system $backlook($which) if {[regexp "^64 " $expect_out(buffer)]} { incr good($system) set newcol [lindex {red orange yellow white} $good($system)] set syslabel [regsub -all {\.} $system "_"] .la_$syslabel config -background $newcol } } eof { # search and remove completed host from idlist set donepos [lsearch $idlist $expect_out(spawn_id)] set idlist [lreplace $idlist $donepos $donepos] incr runningcount -1 } timeout { break } } } } pack .redo .quit -fill both -expand true -padx 5 -pady 5 Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Tcl * Tcl Programming * Tcl Programming Also available on on site courses for larger groups Books covering this topic
Yes. We have over 700 books in our library. Books
covering Tcl, Tk and Expect are listed here and when you've selected a
relevant book we'll link you on to Amazon to order.
Other Examples
This example comes from our "Expect Processes" training module. You'll find a description of the topic and some
other closely related examples on the "Expect Processes" module index page.
Full description of the source code
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