The following are the unix specific services in Python
posix : The most common POSIX system calls (This module provides access to operating system functionality that is standardized by the C Standard and the POSIX standard.)
pwd : The password database (This module provides access to the Unix user account and password database. It is available on all Unix versions.)
spwd : The shadow password database(This module provides access to the Unix shadow password database. It is available on various Unix versions.)
grp : The group database (This module provides access to the Unix group database. It is available on all Unix versions.
crypt : Function to check Unix passwords.Group database entries are reported as a tuple-like object, whose attributes correspond to the members of the group structure)
termios : POSIX style tty control (This module provides an interface to the POSIX calls for tty I/O control.)
tty : Terminal control functions (The tty module defines functions for putting the tty into cbreak and raw modes.)
pty : Pseudo-terminal utilities (The pty module defines operations for handling the pseudo-terminal concept: starting another process and being able to write to and read from its controlling terminal programmatically.)
fcntl : The fcntl and ioctl system calls(This module performs file control and I/O control on file descriptors. It is an interface to the fcntl() and ioctl())
pipes : Interface to shell pipelines.(The pipes module defines a class to abstract the concept of a pipeline : a sequence of converters from one file to another.)
resource : Resource usage information (This module provides basic mechanisms for measuring and controlling system resources utilized by a program.)
nis : Interface to Sun’s NIS (Yellow Pages) (The nis module gives a thin wrapper around the NIS library, useful for central administration of several hosts.)
syslog : Unix syslog library routines (This module provides an interface to the Unix syslog library routines. Refer to the Unix manual pages for a detailed description of the syslog facility.)
