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A

• a64l(), l64a - convert between a 32-bit integer and a radix-64 ASCII string
• abort() - generate an abnormal process abort
• abs() - return an integer absolute value
• accept() - accept a new connection on a socket
• access() - determine accessibility of a file
• acos(), acosf, acosl - arc cosine functions
• acosf() - arc cosine functions
• acosh(), acoshf, acoshl, - inverse hyperbolic cosine functions
• acosl() - arc cosine functions
• admin - create and administer SCCS files (DEVELOPMENT)
• aio_cancel() - cancel an asynchronous I/O request (REALTIME)
• aio_error() - retrieve errors status for an asynchronous I/O operation (REALTIME)
• aio_fsync() - asynchronous file synchronization (REALTIME)
• aio.h - asynchronous input and output (REALTIME)
• aio_read() - asynchronous read from a file (REALTIME)
• aio_return() - retrieve return status of an asynchronous I/O operation (REALTIME)
• aio_suspend() - wait for an asynchronous I/O request (REALTIME)
• aio_write() - asynchronous write to a file (REALTIME)
• alarm() - schedule an alarm signal
• alias - define or display aliases
• ar - create and maintain library archives
• arpa/inet.h - definitions for internet operations
• asa - interpret carriage-control characters
• asctime(), asctime_r - convert date and time to a string
• asin(), asinf, asinl - arc sine function
• asinf() - arc sine function
• asinh(), asinfh, asinfl - inverse hyperbolic sine functions
• asinl() - arc sine function
• assert.h - verify program assertion
• assert() - insert program diagnostics
• atan2(), atan2f, atan2l - arc tangent functions
• atan(), atanf, atanl - arc tangent function
• atanf() - arc tangent function
• atanh(), atanhf, atanhl - inverse hyperbolic tangent functions
• atanl() - arc tangent function
• at - execute commands at a later time
• atexit() - register a function to run at process termination
• atof() - convert a string to double-precision number
• atoi() - convert a string to an integer
• atol(), atoll - convert a string to a long integer
• awk - pattern scanning and processing language

• Abortive Release
• Absolute Pathname
• Access Mode
• Additional File Access Control Mechanism
• Address Space
• Advisory Information
• Affirmative Response
• Alert
• Alert Character (<alert>)
• Alias Name
• Alignment
• Alternate File Access Control Mechanism
• Alternate Signal Stack
• Ancillary Data
• Angle Brackets
• Application
• Application Address
• Application Conformance
• Application Program Interface (API)
• Appropriate Privileges
• Argument
• Arm (a Timer)
• Asterisk
• Async-Cancel-Safe Function
• Asynchronous Events
• Asynchronous Input and Output
• Async-Signal-Safe Function
• Asynchronously-Generated Signal
• Asynchronous I/O Operation
• Asynchronous I/O Completion
• Authentication
• Authorization