Shell

The shell, called Hydre, is the part that interprets scripts.

• Commands
• Pipes
• Specifications

Commands

Hydre works using commands, which can take arguments. When running an application's exposed command, the said application is run in a new process with a specific execution context.

The special thing about running an application from one of its exposed commands is that its CMDIN, CMDUSR, CMDMSG, CMDERR, CMDOUT and CMDRAW pipes are exposed to the caller.

You can find more informations about how a process can interact with a running command in the IPC documentation.

Pipes

When a command is run from Pluton, the command process' pipes are handled as follows:

• All user inputs are sent to the CMDUSR pipe
• All messages sent through CMDMSG and CMDERR pipes are printed as they are received by the shell
• The command's return value (from CMDOUT) is printed after the command completes
• Data written to CMDRAW is not shown, as they don't have to be UTF-8 encoded, or even to be a string. They can be redirected through pipes, though

Specifications

Hydre's specifications can be found in the related document.