You have:

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

• If there are no arg, $#ARGV is -1, $#ARGV is true, $search_for = join(' ', ()).
• If there is one arg, $#ARGV is 0, $#ARGV is false, die("I need a process to look for.").
• If there is two arg, $#ARGV is 1, $#ARGV is true, $search_for = join(' ', $ARGV[0], $ARGV[1]).
• ...

You want

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

Or better yet:

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

I don't understand why that's one one line. It doesn't save anything. I just adds complexity.

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

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