When you fetch transgif, you should save it as is in a file. I'll call the file "transgif", to make things easier. If you use a different filename, you should replace the name "transgif" with that name when you invoke commands. :-)
You need to change the first line of this script to specify the location of perl on your system. (If you edit the script, you probably should use a text editor like vi or ed or emacs.) If you don't know where to find perl on your computer, type the command "which perl", and that should tell you its pathname. If this doesn't work, you probably don't have perl, and will need to use the netpbm package instead of transgif.
chmod u+x transgif
chmod o+rx transgif
-Eric Mumpower (firstname.lastname@example.org)