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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
  [1660] Korn shell - some nuggets - (2008-05-30)
  [1658] Some useful variables and settings in the Korn Shell - (2008-05-30)
  [1367] korn tips - some useful korn shell techniques - (2007-09-25)
  [1365] Korn Shell scripts on the web - (2007-09-25)
  [1364] Korn shell course - resources - (2007-09-24)
  [1361] Korn shell course - (2007-09-22)


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Python in an afternoon - a lecture for experienced programmers
Westonbirt Arboretum Postcode
Equality, sameness and identity - Python
String, Integer, Array, Associative Array - ksh variables
Farewell, Newcastle to Stavanger, Haugsund and Bergen
Be careful of misreading server statistics
A date for your diary - 16th July 2008
The old sayings are the best (FSB)
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