Bug #8550 ยป 0001-Add-caveats-to-Process-spawn-regarding-shell-built-i.patch
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* name => nil : unset the environment variable
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* command...:
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* commandline : command line string which is passed to the standard shell
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* cmdname, arg1, ... : command name and one or more arguments (no shell)
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* cmdname, arg1, ... : command name and one or more arguments (This form does not use the shell. See below for caveats.)
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* [cmdname, argv0], arg1, ... : command name, argv[0] and zero or more arguments (no shell)
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* options: hash
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* clearing environment variables:
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| ... | ... | |
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* current directory:
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* :chdir => str
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*
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* The 'cmdname, arg1, ...' form does not use the shell. However,
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* on different OSes, different things are provided as built-in
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* commands. An example of this is 'echo', which is a built-in
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* on Windows, but is a normal program on Linux and Mac OS X.
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* This means that `Process.spawn 'echo', '%Path%'` will display
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* the contents of the `%Path%` environment variable on Windows,
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* but `Process.spawn 'echo', '$PATH'` prints the literal '$PATH'.
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*
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* If a hash is given as +env+, the environment is
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* updated by +env+ before <code>exec(2)</code> in the child process.
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* If a pair in +env+ has nil as the value, the variable is deleted.
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