Tools to compress data on most unix systems (including Fourierseq):

1. Gzip:

   gzip <inputfile>

   - creates

   <inputfile.gz>

   - common for unix systems, but probably wont' port between unix and mac/windows
2. Zip:

   zip <zipfilename> <inputfilename>

   - should be mac/pc compatible, but I'd test it first to make sure...
3. Bzip:

   bzip2 <inputfile>

   - creates

   <inputfile.bz2>

Also, when you send files remotely, you should check their integrity by running the program "md5sum" on the file on Fourierseq, and then again on the file on the remote system. They should give you the same code, indicating the file's contents are exactly intact.