Greetings, In the lab, I use LaTeX, IDL and Fortran 77 on Linux machines. On my pBook, I can seem to use LaTex (TeXshop) and IDL (6.0 for OS X). But after installing g77 on the Mac, I can't seem to figure out how to use it. Forgive me, I have been, previously, someone who just used Fortran rather than understood its intricacies. When I was using Linux machines, I therefore only wrote the code in Emacs as an xxxx.for file, compiled using "ifc xxx.for" to produce an a.out file which I simply ran via typing "a.out". Now what is the equivalent of those two steps above using g77? Any help?