Merge pull request #937 from zostay/proc-command

Fix #913: Add documentation for shell and command

doc/Type/Proc.pod6

@@ -84,24 +84,39 @@ if the process it run exited unsuccessfully.
 
     method spawn(*@args ($, *@), :$cwd = $*CWD, Hash() :$env = %*ENV) returns Bool:D
 
-Runs the C<Proc> objects with the given command, argument list, working directory and environment.
+Runs the C<Proc> object with the given command, argument list, working directory
+and environment.
+
+=head2 method shell
+
+    method shell($cmd, :$cwd = $*CWD, :$env) returns Bool:D
+
+Runs the C<Proc> object with the given command, which is passed through to the
+shell for parsing and execution.
+
+=head2 method command
+
+    method command(Prod:D:) returns Array:D
+
+The command method is an accessor to an array containing the arguments that were
+passed when the Proc objectd was executed via C<spawn> or C<shell> or C<run>.
 
 =head2 method exitcode
 
-    method exitcode(Proc:D) returns Int:D
+    method exitcode(Proc:D:) returns Int:D
 
 Returns the exit code of the external process, or -1 if it has not exited yet.
 
 =head2 method signal
 
-    method signal(Proc:D)
+    method signal(Proc:D:)
 
 Returns the signal number with which the external process was killed, or 0 or
 an undefined value otherwise.
 
 =head2 method pid
 
-    method pid(Proc:D)
+    method pid(Proc:D:)
 
 Returns the Process Identifier (pid) of the external process, if available.