When a script reads in arguments from the command line, they're put into @ARGV (not @ARG - that's only for passing between subroutines) and you can retrieve them using $ARGV[0] for the first one, etc. (Or use GetOpt)

Most likely your system call is working, and your next script is failing to read in the correct variables, but I can't really tell unless you post more specific code.

HTH
'Fect