my $cmd = [ cmd => ( opt => $val, opt => $val ) ];

##</code><code>##

my $cmd = [ p4 => ( where => $savefile ) ];

##</code><code>##

my $cmd = [ p4 => 'where', $savefile ];
my $cmd = [ qw( p4 where ), $savefile ];
my $cmd = [ 'p4', 'where', $savefile ];