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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.
 
2!:1 y Spawn. (Unix only.) 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.
 
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!:6 y Getpid. The value of the process ID.
 
2!:55 y Terminate Session. y is an integer return code




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