From type/Proc/Async

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method command(Proc::Async:D: --> List:D)

Available as of v6.d.

Returns the command and arguments used for this Proc::Async object:

my $p := Proc::Async.new: 'cat', 'some', 'files';
$p.command.say; # OUTPUT: «(cat some files)␤»

From type/Proc

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method command(Proc:D: --> List:D)

The command method is an accessor to a list containing the arguments that were passed when the Proc object was executed via spawn or shell or run.