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F

• fabs(), fabsf, fabsl - absolute value function
• false - return false value
• fattach() - attach a STREAMS-based file descriptor to a file in the file system name space (STREAMS)
• 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
• fc - process the command history list
• fcvt() - convert a floating-point number to a string (LEGACY)
• fdatasync() - synchronize the data of a file (REALTIME)
• FD_CLR() - macros for synchronous I/O multiplexing
• fdetach() - detach a name from a STREAMS-based file descriptor (STREAMS)
• fdim(), fdimf, fdiml - compute positive difference between two floating-point numbers
• fdopen() - associate a stream with a file descriptor
• feclearexcept() - clear floating-point exception
• fegetenv(), fesetenv - get and set current floating-point environment
• fegetexceptflag(), fesetexceptflag - get and set floating-point status flags
• fegetround(), fesetround - get and set current rounding direction
• feholdexcept() - save current floating-point environment
• fenv.h - floating-point environment
• feof() - test end-of-file indicator on a stream
• feraiseexcept() - raise floating-point exception
• ferror() - test error indicator on a stream
• fesetenv() - set current floating-point environment
• fesetexceptflag() - set floating-point status flags
• fesetround() - set current rounding direction
• fetestexcept() - test floating-point exception flags
• feupdateenv() - update floating-point environment
• fflush() - flush a stream
• ffs() - find first set bit
• 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
• fg - run jobs in the foreground
• file - determine file type
• fileno() - map a stream pointer to a file descriptor
• find - find files
• float.h - floating types
• flockfile(), ftrylockfile, funlockfile - stdio locking functions
• floor(), floorf, floorl - floor function
• fma(), fmaf, fmal - floating-point multiply-add
• fmax(), fmaxf, fmaxl - determine maximum numeric value of two floating-point numbers
• fmin(), fminf, fminl - determine minimum numeric value of two floating-point numbers
• fmod(), fmodf, fmodl - floating-point remainder value function
• fmtmsg() - display a message in the specified format on standard error and/or a system console
• fmtmsg.h - message display structures
• fnmatch.h - filename-matching types
• fnmatch() - match a filename or a pathname
• fold - filter for folding lines
• fopen() - open a stream
• fork() - create a new process
• fort77 - FORTRAN compiler (FORTRAN)
• fpathconf(), pathconf - get configurable pathname variables
• fpclassify() - classify real floating type
• 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
• freeaddrinfo(), getaddrinfo - get address information
• free() - free allocated memory
• freopen() - open a stream
• frexp(), frexpf, frexpl - 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() - synchronize changes to a file
• ftell(), ftello - return a file offset in a stream
• ftime() - get date and time (LEGACY)
• ftok() - generate an IPC key
• ftruncate() - truncate a file to a specified length
• ftrylockfile() - stdio locking functions
• ftw.h - file tree traversal
• ftw() - traverse (walk) a file tree
• funlockfile() - stdio locking functions
• fuser - list process IDs of all processes that have one or more files open
• fwide() - set stream orientation
• fwprintf(), swprintf, wprintf - print formatted wide-character output
• fwrite() - binary output
• fwscanf(), swscanf, wscanf - convert formatted wide-character input

• Feature Test Macro
• Field
• FIFO Special File (or FIFO)
• File
• File Access Permissions
• File Description
• File Descriptor
• File Format Notation
• File Group Class
• File Hierarchy
• File Mode
• File Mode Bits
• Filename
• Filenames
• Filename Portability
• 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)
• Flow Control
• Foreground Job
• Foreground Process
• Foreground Process Group (or Foreground Job)
• Foreground Process Group ID
• Form-Feed Character (<form-feed>)