crypt — Function to check Unix passwords
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
ioctl() Unix routines. For a complete description of these calls, see
ioctl(2) Unix manual pages.
grp — The group database
This module provides access to the Unix group database. It is available on all Unix versions.
nis — Interface to Sun’s NIS (Yellow Pages)
module gives a thin wrapper around the NIS library, useful for central administration of several hosts.
pipes — Interface to shell pipelines
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 (a thinly disguised Unix interface).
pty — Pseudo-terminal utilities
pwd — The password database
This module provides access to the Unix user account and password database. It is available on all Unix versions.
resource — Resource usage information
This module provides basic mechanisms for measuring and controlling system resources utilized by a program.
spwd — The shadow password database
This module provides access to the Unix shadow password database. It is available on various Unix versions.
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
termios — POSIX style tty control
This module provides an interface to the POSIX calls for tty I/O control. For a complete description of these calls, see
termios(3) Unix manual page. It is only available for those Unix versions that support POSIX termios style tty I/O control configured during installation.
tty — Terminal control functions