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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 - arc cosine function
• acosh, asinh, atanh - inverse hyperbolic functions
• add_wch, mvadd_wch, mvwadd_wch, wadd_wch
• add_wchnstr, add_wchstr, mvadd_wchnstr, mvadd_wchstr,
• addch, mvaddch, mvwaddch, waddch
• addchstr, addchnstr, mvaddchstr, mvaddchnstr, mvwaddchstr, mvwaddchnstr
• addnstr, addstr, mvaddnstr, mvaddstr, mvwaddnstr, mvwaddstr waddnstr, waddstr
• addnwstr, addwstr, mvaddnwstr, mvaddwstr, mvwaddnwstr, mvwaddwstr,
• admin - create and administer SCCS files (DEVELOPMENT)
• advance - pattern match given a compiled regular expression
• advance, compile, step, loc1, loc2, locs - compile
• 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 synchronisation
• 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
• 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 - arc sine function
• asinh - hyperbolic arc sine
• assert - insert program diagnostics
• assert.h - verify program assertion
• at - execute commands at a later time
• atan - arc tangent function
• atan2 - arc tangent function
• atanh - hyperbolic arc tangent
• atexit - register a function to run at process termination
• atof - convert a string to double-precision number
• atoi - convert a string to integer
• atol - convert a string to long integer
• attr_get, attr_off, attr_on, attr_set,
• attroff, attron, attrset,
• awk - pattern scanning and processing language

• absolute pathname
• access mode
• additional file access control mechanism
• address space
• affirmative response
• alert
• alert character
• alias name
• alternate file access control mechanism
• alternate signal stack
• angle brackets
• appropriate privileges
• argument
• arm (a timer)
• assignment
• asterisk
• async-cancel safe function
• async-signal safe function
• asynchronously generated signal
• asynchronous I/O operation
• asynchronous I/O completion