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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(), faccessat - determine accessibility of a file descriptor
• acos(), acosf, acosl - arc cosine functions
• acosf(), acos, acosl - arc cosine functions
• acosh(), acoshf, acoshl - inverse hyperbolic cosine functions
• acoshf(), acosh, acoshl - inverse hyperbolic cosine functions
• acoshl(), acosh, acoshf - inverse hyperbolic cosine functions
• acosl(), acos, acosf - arc cosine functions
• admin - create and administer SCCS files (DEVELOPMENT)
• aio.h - asynchronous input and output
• aio_cancel() - cancel an asynchronous I/O request
• aio_error() - retrieve errors status for an asynchronous I/O operation
• aio_fsync() - asynchronous file synchronization
• aio_read() - asynchronous read from a file
• aio_return() - retrieve return status of an asynchronous I/O operation
• aio_suspend() - wait for an asynchronous I/O request
• aio_write() - asynchronous write to a file
• alarm() - schedule an alarm signal
• alias - define or display aliases
• alphasort(), scandir - scan a directory
• 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
• asctime_r(), asctime - convert date and time to a string
• asin(), asinf, asinl - arc sine function
• asinf(), asin, asinl - arc sine function
• asinh(), asinhf, asinhl - inverse hyperbolic sine functions
• asinhf(), asinh, asinhl - inverse hyperbolic sine functions
• asinhl(), asinh, asinhf - inverse hyperbolic sine functions
• asinl(), asin, asinf - arc sine function
• assert() - insert program diagnostics
• assert.h - verify program assertion
• at - execute commands at a later time
• atan(), atanf, atanl - arc tangent function
• atan2(), atan2f, atan2l - arc tangent functions
• atan2f(), atan2, atan2l - arc tangent functions
• atan2l(), atan2, atan2f - arc tangent functions
• atanf(), atan, atanl - arc tangent function
• atanh(), atanhf, atanhl - inverse hyperbolic tangent functions
• atanhf(), atanh, atanhl - inverse hyperbolic tangent functions
• atanhl(), atanh, atanhf - inverse hyperbolic tangent functions
• atanl(), atan, atanf - arc tangent function
• atexit() - register a function to run at process termination
• atof() - convert a string to a double-precision number
• atoi() - convert a string to an integer
• atol(), atoll - convert a string to a long integer
• atoll(), atol - 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 Character (<alert>)
• Alert
• Alias Name
• Alignment
• Alternate File Access Control Mechanism
• Alternate Signal Stack
• Ancillary Data
• Angle Brackets
• Apostrophe Character (<apostrophe>)
• Application Address
• Application Conformance
• Application Program Interface (API)
• Application
• Appropriate Privileges
• Argument
• Arm (a Timer)
• Asterisk Character (<asterisk>)
• Async-Cancel-Safe Function
• Async-Signal-Safe Function
• Asynchronous Events
• Asynchronous I/O Completion
• Asynchronous I/O Operation
• Asynchronous Input and Output
• Asynchronously-Generated Signal
• Authentication
• Authorization