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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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)) |
String, Integer, Array, Associative Array - ksh variables
• In the Korn Shell, variables default to be being strings ...
$ r 26
kay=7
$ r 30
while (( $kay>3 )); do
echo $kay
kay=$kay-1
done;
7
7-1
7-1-1
7-1-1-1
$
• ... but you can declare them as integers.
$ integer kay
$ kay=7
$ kay=$kay-1
$ echo $kay
$ (( g = 8+8 ))
$ echo $g
16
$ h=8+8
$ echo $h
8+8
• Variables can also be arrays
• and even associative arrays (i.e. with named elements)
$ typeset -A stuffing
$ stuffing[turkey]=sage
$ stuffing[chicken]=onion
$ print ${stuffing[turkey]}
sage
$
You can get out the keys and the values to iterate through them ...
typeset -A places
places[Bristol]="Temple_Meads"
places[Radstock]="Shut_Doen"
print ${places[Bristol]}
print ${places[Radstock]}
# Values
print ${places[*]}
# keys
print ${!places[*]} (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) [1658] Some useful variables and settings in the Korn Shell - (2008-05-30) [1660] Korn shell - some nuggets - (2008-05-30)
Some other Articles
Python in an afternoon - a lecture for experienced programmersWestonbirt Arboretum PostcodeEquality, sameness and identity - PythonString, Integer, Array, Associative Array - ksh variablesFarewell, Newcastle to Stavanger, Haugsund and BergenBe careful of misreading server statisticsA date for your diary - 16th July 2008The old sayings are the best (FSB)
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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.
Link to Ezine home page (for reading).
Link to Blogging home page (to add comments).
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