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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Parallel Pinging, using Python Threads or Expect spawn lists

Ping is a very useful command to use within scripts for checking the presence (or absence) of a live system on our network, or indeed on the Internet. However, there are subtle differences in the format of its report on different operating system flavors, so any code that you write that needs to analyse the results may need to be tuned when you re-host.

Here are some similar (but different!) ping responses, by way of example:



earth-wind-and-fire:~ grahamellis$ ping -q -c2 192.168.200.65
PING 192.168.200.65 (192.168.200.65): 56 data bytes

--- 192.168.200.65 ping statistics ---
2 packets transmitted, 0 packets received, 100% packet loss
earth-wind-and-fire:~ grahamellis$



-bash-3.2$ ping -q -c2 192.168.200.65
PING 192.168.200.65 (192.168.200.65) 56(84) bytes of data.

--- 192.168.200.65 ping statistics ---
2 packets transmitted, 0 received, 100% packet loss, time 999ms

-bash-3.2$



wellcouk@tornado:~/public_html$ ping -q -c2 192.168.200.65
PING 192.168.200.65 (192.168.200.65): 56 octets data

--- 192.168.200.65 ping statistics ---
2 packets transmitted, 0 packets received, 100% packet loss
wellcouk@tornado:~/public_html$



Many people find our Python scripts alive, kicking, fullrange and fullandfast useful - both as demonstrations of threading in Python and for live system checking but you do need to change the scripts if you use them to reflect the OS on which you're running!

The same need to tailor applies to Tcl / Expect scripts such as our basic expect example, our Tcl /expect parallel ping examples - we have them already modified for Caldera and Red Hat. Finally, ours Tk example for Linux may also need a little tailoring depending on your Linux flavor!
(written 2009-11-02, updated 2010-11-03)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
Y302 - Python - Threads - What why and how
  [903] Pieces of Python - (2006-10-23)

T212 - Tcl/Tk - Expect Processes
  [287] Checking that all our servers are up and accessible - (2005-04-22)
  [675] Adding PHP tags to an old cgi program - (2006-04-08)
  [1173] Cheat Sheet / Check list for Expect maintainers - (2007-05-02)
  [1785] What is running on your network? (tcl and expect) - (2008-09-04)
  [2474] Using Tcl and Expect to automate repetitive jobs - (2009-10-24)
  [3448] Checking all the systems on a subnet, using Expect and Tk - (2011-09-18)
  [4678] Expect with Ruby - a training example to get you started - (2016-05-18)

T211 - Tcl/Tk - What is Expect? Why use it?
  [286] Automating regular manual procedures - (2005-04-21)
  [435] Expect for Windows - (2005-09-04)
  [1174] Installing Tcl and Expect on Solaris 10 - a checklist - (2007-05-02)
  [1409] What is Expect? - (2007-10-26)
  [1411] Buffering of inputs to expect, and match order - (2007-10-27)
  [1469] Curley brackets v double quotes - Tcl, Tk, Expect - (2007-12-12)
  [1531] Expecting a item from a list of possibles - (2008-02-04)
  [1602] Automating processes through Expect - (2008-04-05)
  [3009] Expect in Perl - a short explanation and a practical example - (2010-10-22)
  [3286] Should we cover expect and/or Tk on our public Tcl courses? - (2011-05-11)
  [3572] Adding Expect on top of Tcl - what is it and where can I get a training course to learn about it? - (2012-01-08)
  [4405] Backup procedures - via backup server - (2015-01-24)

A163 - Web Application Deployment - Network Configuration and Security
  [11] A bolt of lightning on Multicasting - (2004-08-11)
  [37] Security and Safety - (2004-09-03)
  [267] Searching security holes - (2005-04-04)
  [332] Looking up IP addresses - (2005-06-01)
  [506] What are DHCP and DNS? - (2005-11-27)
  [511] Domain Forwarding - 2 ways of doing it - (2005-11-29)
  [1073] Heartbeat script in Perl - (2007-02-09)
  [1408] Wireless hotel tips - FTP and Skype connections failing - (2007-10-26)
  [1666] Slow boot and terminal start on Linux boxes - (2008-06-05)
  [1712] As different as night and tyres - (2008-07-18)
  [1904] Ruby, Perl, Linux, MySQL - some training notes - (2008-11-23)
  [2052] How was my web site compromised? - (2009-02-24)
  [4134] Setting up your MacBook Air as a mobile broadband router - (2013-07-07)


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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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