Exec starts a shell command and connects to the process' stdin and stdout. This accessor implements an interface to the shell of the host. It takes a command and starts it as a process. It connects the process' stdin and stdout to the accessor ports with the same name. FIXME: Provide a selection of shells (e.g., bash, awk, etc)
||string||The stdin of the executing process. A token received on this port is interpreted as a line entered in stdin of the process.|
||string||The stdout of the executing process. Each line read from the executing process is sent out as a token from this port.|
||string||The command to be executed.|
Global object to the shell module provided by the host.
Initialize the accessor and start the process subsequently.
Set up the accessor by defining the inputs and outputs.
Wrap up the execution of the accessor by stopping the process.