Variables in unix

Shell Programming and Scripting
1

Hi,

I have defined 2 variables in a ksh file something like below.

x=abc
y=x

Now, I want to get abc printed using y.

I have tried echo $"$y" and I am getting $x but where as I am expecting abc.
Please suggest.

(something like pointer pointer in C language)

2

I think you are looking for something like this using eval:

#!/usr/dt/bin/dtksh

x=abc
y=x
eval z=\$${y}

print "x: $x"
print "y: $y"
print "z: $z"

# Prove the value of y has not changed:
print "\ny: $y"

exit 0

Output:

$ evaltest
x: abc
y: x
z: abc

y: x
$

eval scans the line twice, first replacing ${y} with it's value, 'x' so then z is equal to $x.

3

Thanks for your reply!!! it works...