Select Code to Download

my $searchfor = $#ARGV ? join(' ',@ARGV) : die("I need a process to lo
+ok for.");

my $searchfor = $#ARGV >= 0 ? join(' ',@ARGV) : die("I need a process 
+to look for.");

my $searchfor = @ARGV ? join(' ',@ARGV) : die("I need a process to loo
+k for.");

@ARGV or die("I need a process to look for.");
my $searchfor = join(' ',@ARGV);