Hi Robin, I might have known you would have IRAF! I see the command line as no big issue. You soon get used to it and once you know what you are doing you can automate the process via scripts which minimises the typing.
Regards Andrew
PS If you use the C Buil convention of file name like Spectra-1.fit you need to get rid of the “-” as IRAF may try to subtract the two files Spectra and 1.fit! I now use underscore “_”.