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#endif
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#endif
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#ifdef unix
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#ifdef unix
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  Unix-alikes pass the command line to a shell (normally \file{/bin/sh},
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  Unix-alikes pass the command line to a shell (normally \file{/bin/sh},
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  and POSIX requires that shell), so \code{command} can be anything the
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  and POSIX requires that shell), so \code{command} can be anything the
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  shell regards as executable, including shell scripts, and it can
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  shell regards as executable, including shell scripts, and it can
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  contain multiple commands separated by \code{;}.
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  contain multiple commands separated by \samp{;}.
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  On Windows, \code{system} does not use a shell and there is a separate
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  On Windows, \code{system} does not use a shell and there is a separate
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  function \code{shell} which passes command lines to a shell.
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  function \code{shell} which passes command lines to a shell.
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  If \code{intern} is \code{TRUE} then \code{popen} is used to invoke the
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  If \code{intern} is \code{TRUE} then \code{popen} is used to invoke the