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Host | 2!:

`2!:0 y` | Host. The list`y` is executed by the host system, and the result is returned. For example,`2!:0 'dir *.exe'`.`` Not available for Windows or Macintosh.
`2!:1 y` | Spawn. Like`2!:0`,`` but yields`''` without waiting for the host to finish. Any output is ignored. For example,`2!:1` can be used to invoke a text-editor. Not available for Windows or Macintosh.

`2!:2 y`

Host IO. (Unix only.) The host command line`y` is passed to`/bin/sh` for processing, connecting two file numbers to the command’s standard input and output. The result is a 3-element list of the process id of the task started and the file numbers associated with its standard input and output. These file numbers also appear in the result of`1!:20` .`` In this case, instead of appearing with a name they appear with the command line, prefixed by`>` (standard input) or`<` (standard output). The files associated with the process should be closed with`1!:22` when no longer in use. See also`2!:3` for a verb to wait for processes to complete.

`2!:3 y` | Wait. (Unix only.) Wait for process id`y` to terminate. The result is the status code returned by the process.
`2!:5 y` | Getenv. The value of the shell environment variable named`y`.`` If the named variable is undefined, the result is 0.
`2!:55 y` | Terminate Session.`y` is an integer return code

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