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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.
korn tips - some useful korn shell techniques

1. If you set PS1 to a string that contains a "!" character, then you'll get the current history number reported as part of the prompt. If you want to rerun the same command number 246 later, all you then need to do is type
r 246

2. If you're debugging a Korn shell script and want to work out what it's doing in part of the script, add in
set -x
at the top of the section that you're especially interetsted in, and
set +x
at the end of that section. Then your script will give you a log of the lines as it runs them together with an indication of how the shell has expanded your shell variables and manipulated your other metacharactes

3. The Korn shell
whence -v
command will show you where the korn shell gets programs and instructions its to ru; unline the operating system's
where
command, whence will be able to tell you about functions, aliases, and builtins as well as the operating systems's stand alone programs

4. Global variables. In the korn shell, variables in the main code are, be dafualt, shared with variables of the same name within the functions. If you want a local variable in a function, you can create it with a
typedef var
command. We have an example of a shell script that defines a function and uses both a global and a local korn shell variable here
(written 2007-09-25)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
A172 - Web Application Deployment - Korn Shell - interactive and programming facilities
  [1361] Korn shell course - (2007-09-22)
  [1364] Korn shell course - resources - (2007-09-24)
  [1365] Korn Shell scripts on the web - (2007-09-25)
  [1658] Some useful variables and settings in the Korn Shell - (2008-05-30)
  [1659] String, Integer, Array, Associative Array - ksh variables - (2008-05-30)
  [1660] Korn shell - some nuggets - (2008-05-30)


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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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