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F

• _Fork(), fork — create a new process
• fabs(), fabsf, fabsl — absolute value function
• fabsf(), fabs, fabsl — absolute value function
• fabsl(), fabs, fabsf — absolute value function
• faccessat(), access — determine accessibility of a file descriptor
• false — return false value
• fc — process the command history list
• fchdir() — change working directory
• fchmod() — change mode of a file
• fchmodat(), chmod — change mode of a file
• fchown() — change owner and group of a file
• fchownat(), chown — change owner and group of a file
• fclose() — close a stream
• fcntl() — file control
• fcntl.h — file control options
• fdatasync() — synchronize the data of a file (REALTIME)
• fdim(), fdimf, fdiml — compute positive difference between two floating-point numbers
• fdimf(), fdim, fdiml — compute positive difference between two floating-point numbers
• fdiml(), fdim, fdimf — compute positive difference between two floating-point numbers
• fdopen() — associate a stream with a file descriptor
• fdopendir(), opendir — open directory associated with file descriptor
• FD_CLR(), pselect, select — synchronous I/O multiplexing
• FD_ISSET(), pselect, select — synchronous I/O multiplexing
• FD_SET(), pselect, select — synchronous I/O multiplexing
• FD_ZERO(), pselect, select — synchronous I/O multiplexing
• 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(), fegetenv — get and set current floating-point environment
• fesetexceptflag(), fegetexceptflag — get and set floating-point status flags
• fesetround(), fegetround — get and set current rounding direction
• fetestexcept() — test floating-point exception flags
• feupdateenv() — update floating-point environment
• fexecve(), environ, execl, execle, execlp, execv, execve, execvp — execute a file
• fflush() — flush a stream
• ffs(), ffsl, ffsll — find first set bit
• ffsl(), ffs, ffsll — find first set bit
• ffsll(), ffs, ffsl — 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
• 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
• floorf(), floor, floorl — floor function
• floorl(), floor, floorf — floor function
• fma(), fmaf, fmal — floating-point multiply-add
• fmaf(), fma, fmal — floating-point multiply-add
• fmal(), fma, fmaf — floating-point multiply-add
• fmax(), fmaxf, fmaxl — determine maximum numeric value of two floating-point numbers
• fmaxf(), fmax, fmaxl — determine maximum numeric value of two floating-point numbers
• fmaxl(), fmax, fmaxf — determine maximum numeric value of two floating-point numbers
• fmemopen() — open a memory buffer stream
• fmin(), fminf, fminl — determine minimum numeric value of two floating-point numbers
• fminf(), fmin, fminl — determine minimum numeric value of two floating-point numbers
• fminl(), fmin, fminf — determine minimum numeric value of two floating-point numbers
• fmod(), fmodf, fmodl — floating-point remainder value function
• fmodf(), fmod, fmodl — floating-point remainder value function
• fmodl(), fmod, fmodf — 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() — match a filename string or a pathname
• fnmatch.h — filename-matching types
• fold — filter for folding lines
• fopen() — open a stream
• fork() — create a new process
• fpathconf(), pathconf — get configurable pathname variables
• fpclassify() — classify real floating type
• fprintf(), asprintf, dprintf, 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
• freeaddrinfo(), getaddrinfo — get address information
• freelocale() — free resources allocated for a locale object
• freopen() — open a stream
• frexp(), frexpf, frexpl — extract significand and exponent from a double precision number
• frexpf(), frexp, frexpl — extract significand and exponent from a double precision number
• frexpl(), frexp, frexpf — extract significand and exponent from a double precision number
• fscanf(), scanf, sscanf — convert formatted input
• fseek(), fseeko — reposition a file-position indicator in a stream
• fseeko(), fseek — reposition a file-position indicator in a stream
• fsetpos() — set current file position
• fstat() — get file status
• fstatat(), lstat, stat — get file status
• fstatvfs(), statvfs — get file system information
• fsync() — synchronize changes to a file
• ftell(), ftello — return a file offset in a stream
• ftello(), ftell — return a file offset in a stream
• ftok() — generate an IPC key
• ftruncate() — truncate a file to a specified length
• ftrylockfile(), flockfile, funlockfile — stdio locking functions
• ftw.h — file tree traversal
• funlockfile(), flockfile, ftrylockfile — stdio locking functions
• fuser — list process IDs of all processes that are using one or more named files
• futimens(), utimensat, utimes — set file access and modification times
• fwide() — set stream orientation
• fwprintf(), swprintf, wprintf — print formatted wide-character output
• fwrite() — binary output
• fwscanf(), swscanf, wscanf — convert formatted wide-character input

• 3.136 Feature Test Macro
• 3.137 Field
• 3.138 FIFO Special File (or FIFO)
• 3.139 File
• 3.140 File Description
• 3.141 File Descriptor
• 3.142 File Group Class
• 3.143 File Lock
• 3.144 File Mode
• 3.145 File Mode Bits
• 3.146 Filename
• 3.147 Filename String
• 3.148 File Offset
• 3.149 File Other Class
• 3.150 File Owner Class
• 3.151 File Permission Bits
• 3.152 File Serial Number
• 3.153 File System
• 3.154 File Type
• 3.155 Filter
• 3.156 First Open (of a File)
• 3.157 Flow Control
• 3.158 Foreground Job
• 3.159 Foreground Process
• 3.160 Foreground Process Group
• 3.161 Foreground Process Group ID
• 3.162 Form-Feed Character (<form-feed>)
• 4.7 File Access Permissions
• 4.8 File Hierarchy
• 4.9 Filenames
• 4.10 Filename Portability
• 4.11 File System Cache
• 4.12 File Times Update
• 5. File Format Notation