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For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
How to interact with a Perl program while it is processing data

If you have a long running program, how do you monitor its progress?

You could use tail -f on an output file ... but there are other options too.

a) You can output a progress line; there's an example of this from the recent Perl for Larget Projects course ... [here].

b) You can trap ^C ... and even have it generate a report (that's included in the same example)

c) You can set up your process to arrange to dump out "results to date" if you send it a signal. That too is imlemented in the same example, and the program that sends the signal is [here]

Lots of tricks / comments / specifics I could tell you about in the example. If it's not obvious how it works, take a look at the course ;-)
(written 2011-07-31)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
P667 - Perl - Handling Huge Data
  [639] Progress bars and other dynamic reports - (2006-03-09)
  [762] Huge data files - what happened earlier? - (2006-06-15)
  [975] Answering ALL the delegate's Perl questions - (2006-12-09)
  [1397] Perl - progress bar, supressing ^C and coping with huge data flows - (2007-10-20)
  [1920] Progress Bar Techniques - Perl - (2008-12-03)
  [1924] Preventing ^C stopping / killing a program - Perl - (2008-12-05)
  [2376] Long job - progress bar techniques (Perl) - (2009-08-26)
  [2805] How are you getting on? - (2010-06-13)
  [2806] Macho matching - do not do it! - (2010-06-13)
  [2834] Teaching examples in Perl - third and final part - (2010-06-27)
  [3374] Speeding up your Perl code - (2011-07-30)


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Sorting data the way YOU want it sorted
New product - ensuring that supply matches demand
What do I mean when I add things in Perl?
Kennet and Avon - Walk from Bedwyn to Pewsey. TransWilts day out.
How to interact with a Perl program while it is processing data
Another busy Week at Well House Manor ... pictures from the midweek
Wearing the new London uniform
From Wiltshire to Weymouth on Sundays
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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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