| 2!:0 y |
Host. list y is executed by host system,
and result is returned. 例如, 2!:0 'dir *.exe'.
Not available for 視窗 or 麥金塔.
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| 2!:1 y |
Spawn. Like 2!:0,
but 得到 '' without waiting for host to finish.
Any output is ignored. 例如, 2!:1 can be used
to invoke a text-editor. Not available for 視窗 or 麥金塔.
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| 2!:2 y |
Host IO. (Unix only.) host 指令行 y
is passed to /bin/sh for processing, connecting two file numbers
to command's standard input與output. result is
a 3-分子 list of process id of task started與
file numbers associated with its standard input與output.
se file numbers also appear 在result of 1!:20.
In this case, instead of appearing with a name y appear
with 指令行, prefixed by > (standard input)
or < (standard output). files associated with
process should be closed with 1!:22 when no longer in use.
See also 2!:3 for 動詞 to wait for processes to complete.
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| 2!:3 y |
Wait. (Unix only.) Wait for process id y
to terminate. result is status code returned by process.
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| 2!:4 y |
指令行. When J is used as a shell, result
of 2!:4 is a boxed list representing 指令行.
first 分子 is name of shell script itself;
subsequent 分子 are 引數, if any.
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| 2!:5 y |
Getenv. value of shell environment variable
named y.If named variable is undefined,
result is 0.
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| 2!:55 y |
Terminate Session. y is an 整數 return code
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