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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
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  [2052] How was my web site compromised? - (2009-02-24)
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T211 - Tcl/Tk - What is Expect? Why use it?
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  [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)
  [3286] Should we cover expect and/or Tk on our public Tcl courses? - (2011-05-11)
  [3009] Expect in Perl - a short explanation and a practical example - (2010-10-22)
  [2474] Using Tcl and Expect to automate repetitive jobs - (2009-10-24)
  [1602] Automating processes through Expect - (2008-04-05)
  [1531] Expecting a item from a list of possibles - (2008-02-04)
  [1469] Curley brackets v double quotes - Tcl, Tk, Expect - (2007-12-12)
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  [1174] Installing Tcl and Expect on Solaris 10 - a checklist - (2007-05-02)
  [1173] Cheat Sheet / Check list for Expect maintainers - (2007-05-02)
  [435] Expect for Windows - (2005-09-04)
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T212 - Tcl/Tk - Expect Processes
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Y302 - Python - Threads - What why and how
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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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