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Shell Programming and Scripting

Complex variable

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# 1  
Old 07-05-2013
Complex variable
If I need the output as below, what syntax I should use. I use only korn shell.
=========In file ===========================
Code:
#!/usr/bin/ksn
P1=cat
P2=dog
P3=bat

for i 1 2 3
do
echo $P$i      # <---------- This line is the problem I face. What I should use.
done

========= End of file =======================
#Expected Result
Code:
cat
dog
bat

#Result
Code:
P1
P2
P3

Last edited by Scrutinizer; 07-05-2013 at 03:41 AM.. Reason: code tags
# 2  
Old 07-05-2013
Code:
eval echo '$'P$i

Last edited by anbu23; 07-05-2013 at 03:46 AM.. Reason: Added quotes around $
This User Gave Thanks to anbu23 For This Post:
kkakarot
# 3  
Old 07-05-2013
Try:
Code:
#!/usr/bin/ksh
P[1]=cat
P[2]=dog
P[3]=bat

for i in 1 2 3
do
  echo "${P[i]}"      # <---------- This line is the problem I face. What I should use.
done

This User Gave Thanks to Scrutinizer For This Post:
kkakarot
# 4  
Old 07-05-2013
Hello,

you can use array concept also in spite of using many variables as follows an example.


Code:
 
$ cat array.ksh

values="dog, cat, bat"
values_actual=`echo $values | sed 's/,//g'`
set -A array_values ${values_actual}
for i in ${array_values[@]}
do
echo $i
done
 
 
$ ksh array.ksh
dog
cat
bat



Hope this helps.


Thanks,
R. Singh
# 5  
Old 07-05-2013
From the command line:-
Code:
Last login: Fri Jul  5 07:32:28 on ttys000
AMIGA:barrywalker~> ksh
AMIGA:uw> P[1]=Barry
AMIGA:uw> P[2]=Walker
AMIGA:uw> P[3]=G0LCU
AMIGA:uw> for i in 1 2 3; do; printf "${P[i]}\n"; done   
Barry
Walker
G0LCU
AMIGA:uw> exit
AMIGA:barrywalker~> _

This User Gave Thanks to wisecracker For This Post:
kkakarot
# 6  
Old 07-05-2013
Quote:
Originally Posted by anbu23
Code:
eval echo '$'P$i

Thank you very much. This is exactly I looking for.

Quote:
Originally Posted by Scrutinizer
Try:
Code:
#!/usr/bin/ksh
P[1]=cat
P[2]=dog
P[3]=bat

for i in 1 2 3
do
  echo "${P[i]}"      # <---------- This line is the problem I face. What I should use.
done

Thank you very much. I jush know the shell script has arrry.

Quote:
Originally Posted by RavinderSingh13
Hello,

you can use array concept also in spite of using many variables as follows an example.


Code:
 
$ cat array.ksh

values="dog, cat, bat"
values_actual=`echo $values | sed 's/,//g'`
set -A array_values ${values_actual}
for i in ${array_values[@]}
do
echo $i
done
 
 
$ ksh array.ksh
dog
cat
bat

Thank you very much. This technique teachs me how to combine stream editor with array.


Hope this helps.


Thanks,
R. Singh
Thank you very much. The other technique to use array with stream editor.

Quote:
Originally Posted by wisecracker
From the command line:-
Code:
Last login: Fri Jul  5 07:32:28 on ttys000
AMIGA:barrywalker~> ksh
AMIGA:uw> P[1]=Barry
AMIGA:uw> P[2]=Walker
AMIGA:uw> P[3]=G0LCU
AMIGA:uw> for i in 1 2 3; do; printf "${P[i]}\n"; done   
Barry
Walker
G0LCU
AMIGA:uw> exit
AMIGA:barrywalker~> _

Thank you very much. printf, Another new command I didn't know before combine with array.

It very kind of you all to suggest solutions to me. Thank you.
Last edited by kkakarot; 07-05-2013 at 04:39 AM.. Reason: fill in some missing word
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