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Linux 手册页字母索引

这个页面基于 man7.org 的字母索引页 做了站内整理。命令名和原始链接保持准确，说明、导航和分区提示改成中文，同时为了云端访问速度，默认只渲染当前字母分组。

索引条目
14971
字母分组
28
缓存时间
2026-04-22 10:30:54

手册分区说明

  • 1用户命令与常用可执行程序
  • 2系统调用接口
  • 3C 函数库与开发接口
  • 5文件格式、配置文件与约定
  • 7概览、约定、协议与杂项
  • 8系统管理命令

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当前条目 1018
总条目 14971
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F
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fabs(3) C 函数库
absolute value of floating-point number
fabs(3p) POSIX 函数库
absolute value function
fabsf(3) C 函数库
absolute value of floating-point number
fabsf(3p) POSIX 函数库
absolute value function
fabsl(3) C 函数库
absolute value of floating-point number
fabsl(3p) POSIX 函数库
absolute value function
faccessat(2) 系统调用
检查用户对文件的权限
原文：check user's permissions for a file
faccessat(3p) POSIX 函数库
determine accessibility of a file relative to directory file descriptor
faccessat2(2) 系统调用
检查用户对文件的权限
原文：check user's permissions for a file
fadvise(1) 用户命令
utility to use the posix_fadvise system call
fadvise64(2) 系统调用
predeclare an access pattern for file data
faillock(8) 系统管理命令
Tool for displaying and modifying the authentication failure record files
faillog(5) 文件格式与约定
login failure logging file
faillog(8) 系统管理命令
display faillog records or set login failure limits
falcodump(1) 用户命令
Dump log data to a file using a Falco source plugin.
fallocate(1) 用户命令
preallocate or deallocate space to a file
false(1) 用户命令
do nothing, unsuccessfully
false(1p) POSIX 用户命令
return false value
FALSE(3x) 扩展函数 / curses
curses data types, constants, and global variables
fanotify(7) 约定、概览与杂项
monitoring filesystem events
fanotify_mark(2) 系统调用
add, remove, or modify an fanotify mark on a filesystem object
fatlabel(8) 系统管理命令
set or get MS-DOS filesystem label or volume ID
fattach(2) 系统调用
未实现的系统调用
原文：unimplemented system calls
fattach(3p) POSIX 函数库
based file descriptor to a file in the file system name space (STREAMS)
fc(1p) POSIX 用户命令
process the command history list
fchdir(2) 系统调用
change working directory
fchdir(3p) POSIX 函数库
change working directory
fchmod(2) 系统调用
change permissions of a file
fchmod(3p) POSIX 函数库
change mode of a file
fchmodat(2) 系统调用
change permissions of a file
fchmodat(3p) POSIX 函数库
change mode of a file relative to directory file descriptor
fchown(2) 系统调用
change ownership of a file
fchown(3p) POSIX 函数库
change owner and group of a file
fchownat(3p) POSIX 函数库
change owner and group of a file relative to directory file descriptor
fcntl(2) 系统调用
manipulate file descriptor
fcntl64(2) 系统调用
manipulate file descriptor
fcvt(3) C 函数库
convert a floating-point number to a string
fcvt_r(3) C 函数库
convert a floating-point number to a string
fd(4) 设备与特殊文件
floppy disk device
fdatasync(2) 系统调用
synchronize a file's in-core state with storage device
fdatasync(3p) POSIX 函数库
synchronize the data of a file (REALTIME)
FD_CLR(3) C 函数库
synchronous I/O multiplexing
fd_clr(3) C 函数库
synchronous I/O multiplexing
FD_CLR(3p) POSIX 函数库
macros for synchronous I/O multiplexing
fd_clr(3p) POSIX 函数库
macros for synchronous I/O multiplexing
fdetach(2) 系统调用
未实现的系统调用
原文：unimplemented system calls
fdetach(3p) POSIX 函数库
based file descriptor (STREAMS)
fdim(3) C 函数库
positive difference
fdim(3p) POSIX 函数库
point numbers
fdimf(3) C 函数库
positive difference
fdiml(3) C 函数库
positive difference
fdisk(8) 系统管理命令
manipulate disk partition table
fdopen(3) C 函数库
stream open functions
fdopen(3p) POSIX 函数库
associate a stream with a file descriptor
fdopendir(3p) POSIX 函数库
open directory associated with file descriptor
FD_SET(3) C 函数库
synchronous I/O multiplexing
fd_set(3) C 函数库
synchronous I/O multiplexing
FD_ZERO(3) C 函数库
synchronous I/O multiplexing
fd_zero(3) C 函数库
synchronous I/O multiplexing
fegetenv(3) C 函数库
floating-point rounding and exception handling
fegetexcept(3) C 函数库
floating-point rounding and exception handling
fegetround(3) C 函数库
floating-point rounding and exception handling
fegetround(3p) POSIX 函数库
get and set current rounding direction
feholdexcept(3) C 函数库
floating-point rounding and exception handling
fenv(3) C 函数库
floating-point rounding and exception handling
feof(3) C 函数库
check and reset stream status
feof(3p) POSIX 函数库
of-file indicator on a stream
ferror(3) C 函数库
check and reset stream status
ferror(3p) POSIX 函数库
test error indicator on a stream
fesetenv(3) C 函数库
floating-point rounding and exception handling
fesetround(3) C 函数库
floating-point rounding and exception handling
fetestexcept(3) C 函数库
floating-point rounding and exception handling
feupdateenv(3) C 函数库
floating-point rounding and exception handling
fexecve(3) C 函数库
execute program specified via file descriptor
ffs(3) C 函数库
find first bit set in a word
ffs(3p) POSIX 函数库
find first set bit
ffsl(3) C 函数库
find first bit set in a word
ffsll(3) C 函数库
find first bit set in a word
fg(1p) POSIX 用户命令
run jobs in the foreground
fgconsole(1) 用户命令
print the number of the active VT.
fgetc(3) C 函数库
input of characters and strings
fgetc(3p) POSIX 函数库
get a byte from a stream
fgetpos(3p) POSIX 函数库
get current file position information
fgets(3) C 函数库
input of characters and strings
fgets(3p) POSIX 函数库
get a string from a stream
fgetwc(3) C 函数库
read a wide character from a FILE stream
fgetwc(3p) POSIX 函数库
character code from a stream
fgetws(3) C 函数库
read a wide-character string from a FILE stream
fgetws(3p) POSIX 函数库
character string from a stream
fgetxattr(2) 系统调用
retrieve an extended attribute value
FICLONE(2const) 手册分区 2const
share some the data of one file with another file
ficlone(2const) 手册分区 2const
share some the data of one file with another file
field_userptr(3x) 扩展函数 / curses
associate application data with a form field
fifo(7) 约定、概览与杂项
first-in first-out special file, named pipe
file-hierarchy(7) 约定、概览与杂项
systemd file system hierarchy requirements
file(1) 用户命令
determine file type
file(1p) POSIX 用户命令
determine file type
filecap(8) 系统管理命令
a program to see capabilities
file_contexts(5) 文件格式与约定
userspace SELinux labeling interface and configuration file format for the file contexts backend
file_contexts.homedirs(5) 文件格式与约定
userspace SELinux labeling interface and configuration file format for the file contexts backend
file_contexts.local(5) 文件格式与约定
userspace SELinux labeling interface and configuration file format for the file contexts backend
file_contexts.subs(5) 文件格式与约定
userspace SELinux labeling interface and configuration file format for the file contexts backend
file_contexts.subs_dist(5) 文件格式与约定
userspace SELinux labeling interface and configuration file format for the file contexts backend
filefrag(8) 系统管理命令
report on file fragmentation
filename(7) 约定、概览与杂项
how pathnames are encoded and interpreted
fileno(3) C 函数库
obtain file descriptor of a stdio stream
fileno(3p) POSIX 函数库
map a stream pointer to a file descriptor
filesystems(5) 文件格式与约定
Linux filesystem types: ext, ext2, ext3, ext4, hpfs, iso9660, JFS, minix, msdos, ncpfs nfs, ntfs, proc, Reiserfs, smb, sysv, umsdos, vfat, XFS, xiafs
filter(3x) 扩展函数 / curses
miscellaneous curses utility routines
filter(7) 约定、概览与杂项
cups file conversion filter interface
fincore(1) 用户命令
count pages of file contents in core
find-filter(1) 用户命令
fine-grained file selection based on time attributes
find(1) 用户命令
search for files in a directory hierarchy
find(1p) POSIX 用户命令
find files
findfs(8) 系统管理命令
find a filesystem by label or UUID
find_pair(3x) 扩展函数 / curses
动态分配 curses 颜色对
原文：dynamically allocate curses color pairs
finite(3) C 函数库
BSD floating-point classification functions
finitef(3) C 函数库
BSD floating-point classification functions
finitel(3) C 函数库
BSD floating-point classification functions
Firecfg(1) 用户命令
Desktop integration utility for Firejail software.
firecfg(1) 用户命令
Desktop integration utility for Firejail software.
firejail-profile(5) 文件格式与约定
Security profile file syntax, and information about building new application profiles.
Firejail(1) 用户命令
Linux namespaces sandbox program
firejail(1) 用户命令
Linux namespaces sandbox program
Firemon(1) 用户命令
Monitoring program for processes started in a Firejail sandbox.
firemon(1) 用户命令
Monitoring program for processes started in a Firejail sandbox.
fixfiles(8) 系统管理命令
fix file SELinux security contexts.
flash(3x) 扩展函数 / curses
ring the (visual) bell of the terminal with curses
flatpak-info(1) 用户命令
Show information about an installed application or runtime
flatpak-pin(1) 用户命令
Pin runtimes to prevent automatic removal
flatpak-run(1) 用户命令
Run an application or open a shell in a runtime
flatpak(1) 用户命令
Build, install and run applications and runtimes
flatpakref(5) 文件格式与约定
Reference to a remote for an application or runtime
flock(1) 用户命令
manage locks from shell scripts
flock(2) 系统调用
apply or remove an advisory lock on an open file
floor(3) C 函数库
largest integral value not greater than argument
floorf(3) C 函数库
largest integral value not greater than argument
floorl(3) C 函数库
largest integral value not greater than argument
flow(8) 系统管理命令
flow based traffic control filter
flower(8) 系统管理命令
flow based traffic control filter
flowtop(8) 系统管理命令
top-like netfilter TCP/UDP/SCTP/DCCP/ICMP(v6) flow tracking
flushinp(3x) 扩展函数 / curses
miscellaneous curses utility routines
fma(3) C 函数库
floating-point multiply and add
fma(3p) POSIX 函数库
point multiply-add
fmaf(3) C 函数库
floating-point multiply and add
fmaf(3p) POSIX 函数库
point multiply-add
fmal(3) C 函数库
floating-point multiply and add
fmal(3p) POSIX 函数库
point multiply-add
fmax(3) C 函数库
determine maximum of two floating-point numbers
fmax(3p) POSIX 函数库
point numbers
fmaxf(3) C 函数库
determine maximum of two floating-point numbers
fmaxl(3) C 函数库
determine maximum of two floating-point numbers
fmin(3) C 函数库
determine minimum of two floating-point numbers
fmin(3p) POSIX 函数库
point numbers
fminf(3) C 函数库
determine minimum of two floating-point numbers
fminl(3) C 函数库
determine minimum of two floating-point numbers
fmod(3) C 函数库
floating-point remainder function
fmod(3p) POSIX 函数库
point remainder value function
fmodf(3) C 函数库
floating-point remainder function
fmodf(3p) POSIX 函数库
point remainder value function
fmodl(3) C 函数库
floating-point remainder function
fmodl(3p) POSIX 函数库
point remainder value function
fmt(1) 用户命令
simple optimal text formatter
fmtmsg(3) C 函数库
print formatted error messages
fmtmsg(3p) POSIX 函数库
display a message in the specified format on standard error and/or a system console
fnmatch(3) C 函数库
match filename or pathname
fnmatch(3p) POSIX 函数库
match a filename string or a pathname
fold(1) 用户命令
wrap each input line to fit in specified width
fold(1p) POSIX 用户命令
filter for folding lines
fopen(3) C 函数库
stream open functions
fork(2) 系统调用
create a child process
fork(3p) POSIX 函数库
create a new process
forkpty(3) C 函数库
terminal utility functions
form(3x) 扩展函数 / curses
present user-fillable forms in curses windows
form_data(3x) 扩展函数 / curses
test for off-screen data in given forms
form_driver(3x) 扩展函数 / curses
command-processing loop of the form system
form_field(3x) 扩展函数 / curses
make and break connections between fields and forms
form_hook(3x) 扩展函数 / curses
set hooks for automatic invocation by applications
form_new(3x) 扩展函数 / curses
create and destroy forms
form_page(3x) 扩展函数 / curses
set and get form page number
form_post(3x) 扩展函数 / curses
write or erase forms from associated subwindows
form_userptr(3x) 扩展函数 / curses
associate application data with a form item
form_win(3x) 扩展函数 / curses
make and break form window and subwindow associations
fort77(1p) POSIX 用户命令
FORTRAN compiler (FORTRAN)
forward(5) 文件格式与约定
email forwarding information file
fpathconf(3) C 函数库
get configuration values for files
fpathconf(3p) POSIX 函数库
get configurable pathname variables
fprintf(3) C 函数库
formatted output conversion
fprocopen(3) C 函数库
stream open functions on files below /proc/##
fputc(3) C 函数库
output of characters and strings
fputc(3p) POSIX 函数库
put a byte on a stream
fputs(3) C 函数库
output of characters and strings
fputs(3p) POSIX 函数库
put a string on a stream
fputwc(3) C 函数库
write a wide character to a FILE stream
fputwc(3p) POSIX 函数库
character code on a stream
fputws(3) C 函数库
write a wide-character string to a FILE stream
fputws(3p) POSIX 函数库
character string on a stream
FQ-PIE(8) 系统管理命令
Flow Queue Proportional Integral controller Enhanced
FQ(8) 系统管理命令
Fair Queue traffic policing
fread(3) C 函数库
binary stream input/output
free(1) 用户命令
Display amount of free and used memory in the system
free(3) C 函数库
allocate and free dynamic memory
free(3p) POSIX 函数库
free allocated memory
freecon(3) C 函数库
get SELinux security context of a process
freeconary(3) C 函数库
get SELinux security context of a process
free_hugepages(2) 系统调用
分配或释放大页内存
原文：allocate or free huge pages
free_item(3x) 扩展函数 / curses
create and destroy menu items
freelocale(3) C 函数库
create, modify, and free a locale object
freelocale(3p) POSIX 函数库
free resources allocated for a locale object
free_pair(3x) 扩展函数 / curses
动态分配 curses 颜色对
原文：dynamically allocate curses color pairs
frexp(3) C 函数库
convert floating-point number to fractional and integral components
frexp(3p) POSIX 函数库
extract mantissa and exponent from a double precision number
frexpf(3) C 函数库
convert floating-point number to fractional and integral components
frexpf(3p) POSIX 函数库
extract mantissa and exponent from a double precision number
frexpl(3) C 函数库
convert floating-point number to fractional and integral components
frexpl(3p) POSIX 函数库
extract mantissa and exponent from a double precision number
fs(5) 文件格式与约定
Linux filesystem types: ext, ext2, ext3, ext4, hpfs, iso9660, JFS, minix, msdos, ncpfs nfs, ntfs, proc, Reiserfs, smb, sysv, umsdos, vfat, XFS, xiafs
fsadm(8) 系统管理命令
utility to resize or check filesystem on a device
fscanf(3) C 函数库
input FILE format conversion
fscanf(3p) POSIX 函数库
convert formatted input
fsck(8) 系统管理命令
check and repair a Linux filesystem
fsck.fat(8) 系统管理命令
check and repair MS-DOS FAT filesystems
fsck.minix(8) 系统管理命令
check consistency of Minix filesystem
fsck.msdos(8) 系统管理命令
check and repair MS-DOS FAT filesystems
fsck.vfat(8) 系统管理命令
check and repair MS-DOS FAT filesystems
fsck.xfs(8) 系统管理命令
do nothing, successfully
fsconfig(2) 系统调用
configure new or existing filesystem context
fseek(3) C 函数库
reposition a stream
fseek(3p) POSIX 函数库
position indicator in a stream
fseeko(3) C 函数库
seek to or report file position
fseeko(3p) POSIX 函数库
position indicator in a stream
fsetpos(3p) POSIX 函数库
set current file position
fsfreeze(8) 系统管理命令
suspend access to a filesystem (Ext3/4, ReiserFS, JFS, XFS)
fsmount(2) 系统调用
instantiate mount object from filesystem context
fsnotifywait(1) 用户命令
wait for changes to files using inotify or fanotify
fsnotifywatch(1) 用户命令
gather filesystem access statistics using inotify or fanotify
fsopen(2) 系统调用
create a new filesystem context
fspick(2) 系统调用
select filesystem for reconfiguration
fstab(5) 文件格式与约定
static information about the filesystems
fstatfs(2) 系统调用
get filesystem statistics
fstrim(8) 系统管理命令
discard unused blocks on a mounted filesystem
fsync(2) 系统调用
synchronize a file's in-core state with storage device
fsync(3p) POSIX 函数库
synchronize changes to a file
ftell(3) C 函数库
reposition a stream
ftell(3p) POSIX 函数库
return a file offset in a stream
ftello(3) C 函数库
seek to or report file position
ftello(3p) POSIX 函数库
return a file offset in a stream
ftime(3) C 函数库
return date and time
ftok(3) C 函数库
convert a pathname and a project identifier to a System V IPC key
ftok(3p) POSIX 函数库
generate an IPC key
ftpusers(5) 文件格式与约定
list of users that may not log in via the FTP daemon
ftruncate(2) 系统调用
truncate a file to a specified length
ftruncate(3p) POSIX 函数库
truncate a file to a specified length
fts(3) C 函数库
traverse a file hierarchy
fts_set(3) C 函数库
traverse a file hierarchy
ftw(3) C 函数库
file tree walk
ftw(3p) POSIX 函数库
traverse (walk) a file tree
ftw.h(0p) POSIX 头文件
file tree traversal
full(4) 设备与特殊文件
always full device
function::MKDEV(3stap) 手册分区 3stap
Creates a value that can be compared to a kernel device number (kdev_t)
function::mkdev(3stap) 手册分区 3stap
Creates a value that can be compared to a kernel device number (kdev_t)
function::ns_euid(3stap) 手册分区 3stap
Returns the effective user ID of a target process as seen in a user namespace
function::ns_pgrp(3stap) 手册分区 3stap
Returns the process group ID of the current process as seen in a pid namespace
function::ns_ppid(3stap) 手册分区 3stap
Returns the process ID of a target process's parent process as seen in a pid namespace
function::ns_sid(3stap) 手册分区 3stap
Returns the session ID of the current process as seen in a pid namespace
function::tz_ctime(3stap) 手册分区 3stap
Convert seconds since epoch into human readable date/time string, with local time zone
fuse(4) 设备与特殊文件
Filesystem in Userspace (FUSE) device
fuse(8) 系统管理命令
configuration and mount options for FUSE file systems
fuse2fs(1) 用户命令
FUSE file system client for ext2/ext3/ext4 file systems
fuser(1) 用户命令
identify processes using files or sockets
fuser(1p) POSIX 用户命令
list process IDs of all processes that have one or more files open
futex(2) 系统调用
fast user-space locking
futex(7) 约定、概览与杂项
fast user-space locking
FUTEX_FD(2const) 手册分区 2const
create a file descriptor associated with a futex
futex_fd(2const) 手册分区 2const
create a file descriptor associated with a futex
futimens(3) C 函数库
change file timestamps with nanosecond precision
futimens(3p) POSIX 函数库
set file access and modification times
futimesat(2) 系统调用
change timestamps of a file relative to a directory file descriptor
fw(8) 系统管理命令
fwmark traffic control filter
fwide(3) C 函数库
set and determine the orientation of a FILE stream
fwide(3p) POSIX 函数库
set stream orientation
fwprintf(3) C 函数库
formatted wide-character output conversion
fwrite(3) C 函数库
binary stream input/output