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  \item{effective_user}{The name of the effective user ID, or
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  \item{effective_user}{The name of the effective user ID, or
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    \code{"unknown"} if it
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    \code{"unknown"} if it
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    cannot be ascertained.  This may differ from the real user in
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    cannot be ascertained.  This may differ from the real user in
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    \sQuote{set-user-ID} processes.}
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    \sQuote{set-user-ID} processes.}
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#ifdef unix
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#ifdef unix
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  The first five fields come from the \code{uname(2)} system call.  The
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  The first five fields come from the \code{uname(2)} system call.  The
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  login name comes from \code{getlogin(2)}, and the user names from
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  login name comes from \code{getlogin(2)}, and the user names from
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  \code{getpwuid(getuid())} and \code{getpwuid(geteuid())}
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  \code{getpwuid(getuid())} and \code{getpwuid(geteuid())}
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#endif
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#endif
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}
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}
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  The meaning of OS \sQuote{release} and \sQuote{version} is
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  The meaning of OS \sQuote{release} and \sQuote{version} is
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  system-dependent and there is no guarantee that the node or
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  system-dependent and there is no guarantee that the node or
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  login or user names will be what you might reasonably expect.
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  login or user names will be what you might reasonably expect.
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  (In particular on some Linux distributions the login name is unknown
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  (In particular on some Linux distributions the login name is unknown
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  from sessions with re-directed inputs.)
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  from sessions with re-directed inputs.)
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  The use of alternatives such as \code{system("whoami")} is not
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  The use of alternatives such as \code{system("whoami")} is not
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  portable: the POSIX command \code{system("id")} is much more portable
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  portable: the POSIX command \code{system("id")} is much more portable
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  on Unix-alikes, provided only the POSIX options are used (and not the
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  on Unix-alikes, provided only the POSIX options are used (and not the
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  many GNU extensions).
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  many GNU extensions).
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}
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}