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F

• FD_CLR - macros for synchronous I/O multiplexing
• fabs - absolute value function
• false - return false value
• fattach - attach a STREAMS-based file descriptor to a file
• fc - process the command history list
• fchdir - change working directory
• fchmod - change mode of a file
• fchown - change owner and group of a file
• fclose - close a stream
• fcntl - file control
• fcntl.h - file control options
• fcvt - convert a floating-point number to a string
• fdatasync - synchronise the data of a file
• fdetach - detach a name from a STREAMS-based file descriptor
• fdopen - associate a stream with a file descriptor
• feof - test end-of-file indicator on a stream
• ferror - test error indicator on a stream
• fflush - flush a stream
• ffs - find first set bit
• fg - run jobs in the foreground
• fgetc - get a byte from a stream
• fgetpos - get current file position information
• fgets - get a string from a stream
• fgetwc - get a wide-character code from a stream
• fgetws - get a wide-character string from a stream
• fgrep - search a file for a fixed-string pattern (LEGACY)
• file - determine file type
• fileno - map a stream pointer to a file descriptor
• filter - disable use of certain terminal capabilities
• find - find files
• flash - flash the screen
• float.h - floating types
• flockfile, ftrylockfile, funlockfile - stdio locking functions
• floor - floor function
• flushinp - discard input
• fmod - floating-point remainder value function
• fmtmsg - display a message in the specified format on standard
• fmtmsg.h - message display structures
• fnmatch - match a filename or a pathname
• fnmatch.h - filename-matching types
• fold - filter for folding lines
• fopen - open a stream
• fork - create a new process
• fort77 - FORTRAN compiler (FORTRAN)
• fpathconf, pathconf - get configurable pathname variables
• fprintf, printf, snprintf, sprintf - print formatted output
• fputc - put a byte on a stream
• fputs - put a string on a stream
• fputwc - put a wide-character code on a stream
• fputws - put a wide-character string on a stream
• fread - binary input
• free - free allocated memory
• freopen - open a stream
• frexp - extract mantissa and exponent from a double precision number
• fscanf, scanf, sscanf - convert formatted input
• fseek, fseeko - reposition a file-position indicator in a stream
• fsetpos - set current file position
• fstat - get file status
• fstatvfs, statvfs - get file system information
• fsync - synchronise changes to a file
• ftell - return a file offset in a stream (XNS)
• ftell, ftello - return a file offset in a stream
• ftime - get date and time
• ftok - generate an IPC key
• ftruncate, truncate - truncate a file to a specified length
• ftrylockfile - stdio locking functions
• ftw - traverse (walk) a file tree
• ftw.h - file tree traversal
• funlockfile - stdio locking functions
• fuser - list process IDs of all processes that have one or more
• fwide - set stream orientation
• fwprintf, wprintf, swprintf - print formatted wide-character output
• fwrite - binary output
• fwscanf, wscanf, swscanf - convert formatted wide-character input

• feature test macro
• feature groups
• field
• FIFO special file
• file
• file access permissions
• file description
• file descriptor
• file group class
• file hierarchy
• file mode
• file mode bits
• filename
• file offset
• file other class
• file owner class
• file permission bits
• file serial number
• file system
• file times update
• file type
• filter
• first open (of a file)
• foreground job
• foreground process
• foreground process group
• foreground process group ID
• form-feed character