topic Re: Using arrays in ksh script in Operating System - HP-UX

Using arrays in ksh script

Lorenzo Meneguzzi — Thu, 29 Jan 2004 10:36:52 GMT

Hi,
I'm trying to use arrays in a ksh script.
I'm implementing an example found on the forum.
But it doesn't work and I can't see why !
the commands are :
DAYS[0]=Mon
DAYS[1]=Tue
DAYS[2]=Wed
print $DAYS
print $DAYS[0]
print $DAYS[1]
print $DAYS[2]

and the result is :
DAYS: not found
DAYS: not found
DAYS: not found

Where is the problem ? (Am I using a wrong ksh ?)
Thanks for your help.

Re: Using arrays in ksh script

Mark Grant — Thu, 29 Jan 2004 10:40:52 GMT

This is how arrays are supposed to be used.

colour[0]=red
colour[1]=blue
colour[2]=red
colour[3]=green
colour[4]=green
colour[5]=blue
colour[6]=yellow
colour[7]=cyan
colour[8]=red
colour[9]=blue

echo ${colour[2]}

That will output "red"

Re: Using arrays in ksh script

Mark Grant — Thu, 29 Jan 2004 10:44:04 GMT

Although your example hasn't come out in the example you posted, I think it looks like you have missed outh the "${" and "}" around the whole variable thing.

Re: Using arrays in ksh script

A. Clay Stephenson — Thu, 29 Jan 2004 10:47:09 GMT

This is one of those times when discipline counts. ALWAYS enclose shell variables in braces and you will have no problems.

#!/usr/bin/ksh

DAYS[0]="Mon"
DAYS[1]="Tue"
DAYS[2]="Wed"

#Now try this:
print $DAYS[1]
print ${DAYS[1]}

Re: Using arrays in ksh script

Chris Vail — Thu, 29 Jan 2004 11:02:42 GMT

Here's a re-write of Mark's script:
colour[0]=red
colour[1]=blue
colour[2]=red
colour[3]=green
colour[4]=green
colour[5]=blue
colour[6]=yellow
colour[7]=cyan
colour[8]=red
colour[9]=blue
COUNTER=0
while test "$COUNTER" -lt "10"
do
echo $COUNTER ${colour[$COUNTER]}
(( COUNTER = "$COUNTER" + "1" ))
done

You can see the syntax of how the subscript works then.

Re: Using arrays in ksh script

Lorenzo Meneguzzi — Thu, 29 Jan 2004 11:30:09 GMT

Thanks.
It's MUCH EASIER this way !

Re: Using arrays in ksh script

Sridhar Bhaskarla — Thu, 29 Jan 2004 12:06:48 GMT

Hi,

It's easy to get confused with Arrays. Following script may give you little more information on ARRAYs.

set -A ARRAY

ARRAY[0]="elem 1 "
ARRAY[1]="elem 2"
ARRAY[2]="elem 3"
ARRAY[3]="elem 4"
ARRAY[4]="elem 5"

typeset -i num_elms=${#ARRAY[@]}
typeset -i count=0

while [ $count -lt num_elms ]
do
echo "ARRAY[$count] is ${ARRAY[$count]}"
(( count = $count + 1 ))
done

-Sri