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update doc.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36245 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2012-06-28 10:38:26 +00:00
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commit f559d61607
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process.c
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@ -3884,6 +3884,9 @@ rb_f_system(int argc, VALUE *argv)
*
* :close_others is true by default for spawn and IO.popen.
*
* Note that fds which close-on-exec flag is already set are closed
* regardless of :close_others option.
*
* So IO.pipe and spawn can be used as IO.popen.
*
* # similar to r = IO.popen(command)