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\chapter{UNIX Specific Services}
The modules described in this chapter provide interfaces to features
that are unique to the \UNIX{} operating system, or in some cases to
some or many variants of it. Here's an overview:
\begin{description}
\item[posix]
--- The most common Posix system calls (normally used via module \code{os}).
\item[posixpath]
--- Common Posix pathname manipulations (normally used via \code{os.path}).
\item[pwd]
--- The password database (\code{getpwnam()} and friends).
\item[grp]
--- The group database (\code{getgrnam()} and friends).
\item[crypt]
--- The (\code{crypt()} function used to check Unix passwords).
\item[dbm]
--- The standard ``database'' interface, based on \code{ndbm}.
\item[gdbm]
--- GNU's reinterpretation of dbm.
\item[termios]
--- Posix style tty control.
\item[fcntl]
--- The \code{fcntl()} and \code{ioctl()} system calls.
\item[posixfile]
--- A file-like object with support for locking.
\end{description}
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