Hi all, i have a problem in running an idl program. i have input file called 6hr.txt and program called PE.pro and i want the output to be put in the file called test.txt.I'm using command line in linux machine. Here is what happened. IDL> .RUN 6hr.txt,test.txt % Error opening file. File: test.txt Any idea of what the problem might be? Thanks, Petero