If your program installs into the path as the file named "ipchange" then it is an appropriate name. However, that name seems to imply that it changes IPs, which does not match your description. Maybe "ipmonitor" or "ipchangemon" or "ipwatchd"? Anyway, my preferred way to release apps is to have a module (lib/X.pm) and then a script (bin/x) which parses the command line (Getopt::Long + Pod::Usage) and invokes that module. This way people get both interfaces (module+command). In a perl dist, the binary would usually be "bin/x.PL" until processed by MakeMaker to become installed as "bin/x". If the dist is not just a shell command, I think maybe a mixed case name is appropriate.