Evaluating a variable within a variable

[TimtheEagle]

Hi,

my problem is best desrbied with a simple example as follows.  I know that
technically it is not correct but it illustrates what I am struggling to
achieve.


#########

main_auth=7

f=main
t=auth

ile=$f"_"$t

echo $ile

########

I want the output from echo on the line above to be 7.  The main_auth=7 will
be read from a separate file in due course.

I hope that is clear enough.

Any help greatly appreciated.

Thanks  Cheers Tim 
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