Hi All,

I am trying to call IDL program through perl as following:

open(IDL,"|/opt/harris/envi5.4.0/envi54/idl86/bin/idl")|| die "Can't open IDL: $!";
print IDL ".Compile classify \n";
print IDL "classify \n";
close(IDL);

This code works well when there is no ENVI library function in IDL program, but does not work when there is a ENVI function (like ENVITASK) in IDL program.
The error shows: Variable is undefined: ENVITASK.

Could you please tell me how to fix this problem when perl call IDL programs with ENVI function?
Many thanks in advance.

Ellen