@_ gets set to the parameters passed to a function call, not for the command line parameters. For that you use @ARGV: 
$ perl -e 'print @_;print "::\n";print @ARGV;' camel
::
camel

[download]
To get the number of parameters, you use @ARGV in scalar context: 
$ perl -e ''print scalar @ARGV;' my camel
2

[download]

CU
Robartes-

In reply to Re: Test for parameters? by robartes
in thread Test for parameters? by Guildencrantz

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