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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(), accept4 — accept a new connection on a socket
• accept4(), 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
• aligned_alloc() — allocate memory with a specified alignment
• alphasort(), scandir — scan a directory
• ar — create and maintain library archives
• arpa/inet.h — definitions for internet operations
• asa — interpret carriage-control characters
• asctime() — 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
• asprintf(), dprintf, fprintf, printf, snprintf, sprintf — print formatted output
• 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 be called from exit() or after return from main()
• 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
• atomic_compare_exchange_strong(), atomic_compare_exchange_strong_explicit, atomic_compare_exchange_weak, atomic_compare_exchange_weak_explicit — atomically compare and exchange the values of two objects
• atomic_compare_exchange_strong_explicit(), atomic_compare_exchange_strong, atomic_compare_exchange_weak, atomic_compare_exchange_weak_explicit — atomically compare and exchange the values of two objects
• atomic_compare_exchange_weak(), atomic_compare_exchange_strong, atomic_compare_exchange_strong_explicit, atomic_compare_exchange_weak_explicit — atomically compare and exchange the values of two objects
• atomic_compare_exchange_weak_explicit(), atomic_compare_exchange_strong, atomic_compare_exchange_strong_explicit, atomic_compare_exchange_weak — atomically compare and exchange the values of two objects
• atomic_exchange(), atomic_exchange_explicit — atomically exchange the value of an object
• atomic_exchange_explicit(), atomic_exchange — atomically exchange the value of an object
• atomic_fetch_add(), atomic_fetch_add_explicit, atomic_fetch_and, atomic_fetch_and_explicit, atomic_fetch_or, atomic_fetch_or_explicit, atomic_fetch_sub, atomic_fetch_sub_explicit, atomic_fetch_xor, atomic_fetch_xor_explicit — atomically replace the value of an object with the result of a computation
• atomic_fetch_add_explicit(), atomic_fetch_add, atomic_fetch_and, atomic_fetch_and_explicit, atomic_fetch_or, atomic_fetch_or_explicit, atomic_fetch_sub, atomic_fetch_sub_explicit, atomic_fetch_xor, atomic_fetch_xor_explicit — atomically replace the value of an object with the result of a computation
• atomic_fetch_and(), atomic_fetch_add, atomic_fetch_add_explicit, atomic_fetch_and_explicit, atomic_fetch_or, atomic_fetch_or_explicit, atomic_fetch_sub, atomic_fetch_sub_explicit, atomic_fetch_xor, atomic_fetch_xor_explicit — atomically replace the value of an object with the result of a computation
• atomic_fetch_and_explicit(), atomic_fetch_add, atomic_fetch_add_explicit, atomic_fetch_and, atomic_fetch_or, atomic_fetch_or_explicit, atomic_fetch_sub, atomic_fetch_sub_explicit, atomic_fetch_xor, atomic_fetch_xor_explicit — atomically replace the value of an object with the result of a computation
• atomic_fetch_or(), atomic_fetch_add, atomic_fetch_add_explicit, atomic_fetch_and, atomic_fetch_and_explicit, atomic_fetch_or_explicit, atomic_fetch_sub, atomic_fetch_sub_explicit, atomic_fetch_xor, atomic_fetch_xor_explicit — atomically replace the value of an object with the result of a computation
• atomic_fetch_or_explicit(), atomic_fetch_add, atomic_fetch_add_explicit, atomic_fetch_and, atomic_fetch_and_explicit, atomic_fetch_or, atomic_fetch_sub, atomic_fetch_sub_explicit, atomic_fetch_xor, atomic_fetch_xor_explicit — atomically replace the value of an object with the result of a computation
• atomic_fetch_sub(), atomic_fetch_add, atomic_fetch_add_explicit, atomic_fetch_and, atomic_fetch_and_explicit, atomic_fetch_or, atomic_fetch_or_explicit, atomic_fetch_sub_explicit, atomic_fetch_xor, atomic_fetch_xor_explicit — atomically replace the value of an object with the result of a computation
• atomic_fetch_sub_explicit(), atomic_fetch_add, atomic_fetch_add_explicit, atomic_fetch_and, atomic_fetch_and_explicit, atomic_fetch_or, atomic_fetch_or_explicit, atomic_fetch_sub, atomic_fetch_xor, atomic_fetch_xor_explicit — atomically replace the value of an object with the result of a computation
• atomic_fetch_xor(), atomic_fetch_add, atomic_fetch_add_explicit, atomic_fetch_and, atomic_fetch_and_explicit, atomic_fetch_or, atomic_fetch_or_explicit, atomic_fetch_sub, atomic_fetch_sub_explicit, atomic_fetch_xor_explicit — atomically replace the value of an object with the result of a computation
• atomic_fetch_xor_explicit(), atomic_fetch_add, atomic_fetch_add_explicit, atomic_fetch_and, atomic_fetch_and_explicit, atomic_fetch_or, atomic_fetch_or_explicit, atomic_fetch_sub, atomic_fetch_sub_explicit, atomic_fetch_xor — atomically replace the value of an object with the result of a computation
• atomic_flag_clear(), atomic_flag_clear_explicit — clear an atomic flag
• atomic_flag_clear_explicit(), atomic_flag_clear — clear an atomic flag
• atomic_flag_test_and_set(), atomic_flag_test_and_set_explicit — test and set an atomic flag
• atomic_flag_test_and_set_explicit(), atomic_flag_test_and_set — test and set an atomic flag
• atomic_init() — initialize an atomic object
• atomic_is_lock_free() — indicate whether or not atomic operations are lock-free
• atomic_load(), atomic_load_explicit — atomically obtain the value of an object
• atomic_load_explicit(), atomic_load — atomically obtain the value of an object
• atomic_signal_fence(), atomic_thread_fence — fence operations
• atomic_store(), atomic_store_explicit — atomically store a value in an object
• atomic_store_explicit(), atomic_store — atomically store a value in an object
• atomic_thread_fence(), atomic_signal_fence — fence operations
• at_quick_exit() — register a function to to be called from quick_exit()
• awk — pattern scanning and processing language

• 2.2 Application Conformance
• 3.1 Abortive Release
• 3.2 Absolute Pathname
• 3.3 Access Mode
• 3.4 Additional File Access Control Mechanism
• 3.5 Address Space
• 3.6 Advisory Information
• 3.7 Affirmative Response
• 3.8 Alert
• 3.9 Alert Character (<alert>)
• 3.10 Alias Name
• 3.11 Alignment
• 3.12 Alternate File Access Control Mechanism
• 3.13 Alternate Signal Stack
• 3.14 Ancillary Data
• 3.15 Angle Brackets
• 3.16 Anonymous Memory Object
• 3.17 Apostrophe Character (<apostrophe>)
• 3.18 Application
• 3.19 Application Address
• 3.20 Application Program Interface (API)
• 3.21 Appropriate Privileges
• 3.22 Argument
• 3.23 Arm (a Timer)
• 3.24 Asterisk Character (<asterisk>)
• 3.25 Async-Cancel-Safe Function
• 3.26 Asynchronous Events
• 3.27 Asynchronous Input and Output
• 3.28 Async-Signal-Safe Function
• 3.29 Asynchronously-Generated Signal
• 3.30 Asynchronous I/O Completion
• 3.31 Asynchronous I/O Operation
• 3.32 Atomic Operation
• 3.33 Authentication
• 3.34 Authorization