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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.
Some useful variables and settings in the Korn Shell

Here are some hidden "gems" ...

• -C sets "noclobber" mode in which redirects do not overwrite files

$ set -C
$
$ ls > fred
$ ls > fred
ksh: cannot create fred: File exists
$ set +C
$ ls > fred
$


• CDPATH lets you change the target for your cd command to a list of directories whihc are searched in turn.

$ CDPATH=/etc:/bin
$ pwd
/home/trainee/sefas/f
$ cd
$ pwd
/home/trainee
$ cd init.d
/etc/init.d
$

• OLDPWD remembers where you were last in ksh, and cd - takes you there

$ pwd
/home/trainee
$ echo $OLDPWD
/etc/init.d
$ cd -
/etc/init.d
$


• Korn Shell - elapsed seconds, and a randon number between 0 and 32767

$ echo $SECONDS
14294
$ r
echo $SECONDS
14297
$ r
echo $SECONDS
14299
$ r
echo $SECONDS
14301
$ echo $RANDOM
28369
$ r
echo $RANDOM
5877
$ r
echo $RANDOM
28995
$

(written 2008-05-30)

 
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)
  [1367] korn tips - some useful korn shell techniques - (2007-09-25)
  [1659] String, Integer, Array, Associative Array - ksh variables - (2008-05-30)
  [1660] Korn shell - some nuggets - (2008-05-30)


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A date for your diary - 16th July 2008
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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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