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U (continued)

uncompress(1p)expand compressed data✨
undocumented(3)undocumented library functions✨
unexpand(1p)convert spaces to tabs✨
unget(1p)undo a previous get of an SCCS file (DEVELOPMENT)✨
ungetc(3)FILE get character✨
ungetc(3p)push byte back into input stream✨
ungetwc(3)push back a wide character onto a FILE stream✨
ungetwc(3p)push wide-character code back into the input stream✨
unicode(7)universal character set✨
unimplemented(2)unimplemented system calls✨
uniq(1p)report or filter out repeated lines in a file✨
unistd.h(0p)standard symbolic constants and types✨
units(7)decimal and binary prefixes✨
unix(7)sockets for local interprocess communication✨
unlink(1p)call the unlink() function✨
unlink(2)delete a name and possibly the file it refers to✨
unlink(3p)remove a directory entry✨
unlinkat(2)delete a name and possibly the file it refers to✨
unlocked_stdio(3)nonlocking stdio functions✨
unlockpt(3)unlock a pseudoterminal master/slave pair✨
unlockpt(3p)unlock a pseudo-terminal master/slave pair✨
unset(1p)unset values and attributes of variables and functions✨
unsetenv(3)change or add an environment variable✨
unsetenv(3p)remove an environment variable✨
unshare(2)disassociate parts of the process execution context✨
updwtmp(3)append an entry to the wtmp file✨
updwtmpx(3)append an entry to the wtmp file✨
urandom(4)kernel random number source devices✨
uretprobe(2)execute pending return uprobes✨
uri(7)uniform resource identifier (URI), including a URL or URN✨
url(7)uniform resource identifier (URI), including a URL or URN✨
urn(7)uniform resource identifier (URI), including a URL or URN✨
useconds_t(3type)integer time✨
uselib(2)load shared library✨
uselocale(3)set/get the locale for the calling thread✨
uselocale(3p)use locale in current thread✨
user-keyring(7)per-user keyring✨
user-session-keyring(7)per-user default session keyring✨
user_namespaces(7)overview of Linux user namespaces✨
userfaultfd(2)create a file descriptor for handling page faults in user space✨
usleep(3)suspend execution for microsecond intervals✨
ustat(2)get filesystem statistics✨
ustpcpy(3)copying strings and character sequences✨
ustr2stp(3)copying strings and character sequences✨
utf-8(7)an ASCII compatible multibyte Unicode encoding✨
utf8(7)an ASCII compatible multibyte Unicode encoding✨
utime(2)change file last access and modification times✨
utime(3p)set file access and modification times✨
utime.h(0p)access and modification times structure✨
utimensat(2)change file timestamps with nanosecond precision✨
utimensat(3p)set file access and modification times✨
utimes(2)change file last access and modification times✨
utmp(5)login records✨
utmpname(3)access utmp file entries✨
utmpx(5)login records✨
utmpx.h(0p)user accounting database definitions✨
utmpxname(3)access utmp file entries✨
uts_namespaces(7)overview of Linux UTS namespaces✨
uucp(1p)system-to-system copy✨
uudecode(1p)decode a binary file✨
uuencode(1p)encode a binary file✨
uustat(1p)uucp status enquiry and job control✨
uux(1p)remote command execution✨

V

va_arg(3)variable argument lists✨
va_arg(3p)handle variable argument list✨
va_copy(3)variable argument lists✨
va_end(3)variable argument lists✨
va_list(3type)variable argument list✨
va_start(3)variable argument lists✨
val(1p)validate SCCS files (DEVELOPMENT)✨
valloc(3)page-aligned memory allocation✨
vaprintf(3)allocate and print formatted string✨
vasprintf(3)print to allocated string✨
vcs(4)virtual console memory✨
vcsa(4)virtual console memory✨
vdprintf(3)formatted output conversion✨
vdso(7)overview of the virtual ELF dynamic shared object✨
verr(3)formatted error messages✨
verrx(3)formatted error messages✨
versionsort(3)scan a directory for matching entries✨
veth(4)Virtual Ethernet Device✨
VFAT_IOCTL_READDIR_BOTH(2const)read filenames of a directory in a FAT filesystem✨
VFAT_IOCTL_READDIR_SHORT(2const)read filenames of a directory in a FAT filesystem✨
vfork(2)create a child process and block parent✨
vfprintf(3)formatted output conversion✨
vfprintf(3p)format output of a stdarg argument list✨
vfscanf(3)input FILE format conversion✨
vfscanf(3p)format input of a stdarg argument list✨
vfwprintf(3)formatted wide-character output conversion✨
vfwprintf(3p)wide-character formatted output of a stdarg argument list✨
vfwscanf(3p)wide-character formatted input of a stdarg argument list✨
vhangup(2)virtually hangup the current terminal✨
vi(1p)screen-oriented (visual) display editor✨
vlimit(3)get/set resource limits✨
vm86(2)enter virtual 8086 mode✨
vm86old(2)enter virtual 8086 mode✨
vmsplice(2)splice user pages to/from a pipe✨
void(3type)abstract type✨
vprintf(3)formatted output conversion✨
vprintf(3p)format the output of a stdarg argument list✨
vscanf(3)input FILE format conversion✨
vscanf(3p)format input of a stdarg argument list✨
vserver(2)unimplemented system calls✨
vsnprintf(3)string print formatted✨
vsnprintf(3p)format output of a stdarg argument list✨
vsock(7)Linux VSOCK address family✨
vsprintf(3)string print formatted✨
vsscanf(3)input string format conversion✨
vsscanf(3p)format input of a stdarg argument list✨
vswprintf(3)formatted wide-character output conversion✨
vswprintf(3p)wide-character formatted output of a stdarg argument list✨
vswscanf(3p)wide-character formatted input of a stdarg argument list✨
vsyslog(3)send messages to the system logger✨
VT_ACTIVATE(2const)ioctls for console terminal and virtual consoles✨
VT_DISALLOCATE(2const)ioctls for console terminal and virtual consoles✨
VT_GETCONSIZECSRPOS(2const)ioctls for console terminal and virtual consoles✨
VT_GETMODE(2const)ioctls for console terminal and virtual consoles✨
VT_GETSTATE(2const)ioctls for console terminal and virtual consoles✨
VT_OPENQRY(2const)ioctls for console terminal and virtual consoles✨
VT_RELDISP(2const)ioctls for console terminal and virtual consoles✨
VT_RESIZE(2const)ioctls for console terminal and virtual consoles✨
VT_RESIZEX(2const)ioctls for console terminal and virtual consoles✨
VT_SETMODE(2const)ioctls for console terminal and virtual consoles✨
VT_WAITACTIVE(2const)ioctls for console terminal and virtual consoles✨
vtimes(3)get resource usage✨
vwarn(3)formatted error messages✨
vwarnx(3)formatted error messages✨
vwprintf(3)formatted wide-character output conversion✨
vwprintf(3p)wide-character formatted output of a stdarg argument list✨
vwscanf(3p)wide-character formatted input of a stdarg argument list✨

W

wait(1p)await process completion✨
wait(2)wait for process to change state✨
wait(3p)wait for a child process to stop or terminate✨
wait3(2)wait for process to change state, BSD style✨
wait4(2)wait for process to change state, BSD style✨
waitid(2)wait for process to change state✨
waitid(3p)wait for a child process to change state✨
waitpid(2)wait for process to change state✨
waitpid(3p)wait for a child process to stop or terminate✨
warn(3)formatted error messages✨
warnx(3)formatted error messages✨
wavelan(4)AT&T GIS WaveLAN ISA device driver✨
wc(1p)word, line, and byte or character count✨
wchar.h(0p)wide-character handling✨
wchar_t(3type)wide-character type✨
wcpcpy(3)copy a wide-character string, returning a pointer to its end✨
wcpcpy(3p)copy a wide-character string, returning a pointer to its end✨
wcpncpy(3)copy a fixed-size string of wide characters, returning a pointer to its end✨
wcpncpy(3p)copy a fixed-size wide-character string, returning a pointer to its end✨
wcrtomb(3)convert a wide character to a multibyte sequence✨
wcrtomb(3p)convert a wide-character code to a character (restartable)✨
wcscasecmp(3)compare two wide-character strings, ignoring case✨
wcscasecmp(3p)case-insensitive wide-character string comparison✨
wcscat(3)concatenate two wide-character strings✨
wcscat(3p)concatenate two wide-character strings✨
wcschr(3)search a wide character in a wide-character string✨
wcschr(3p)wide-character string scanning operation✨
wcscmp(3)compare two wide-character strings✨
wcscmp(3p)compare two wide-character strings✨
wcscoll(3p)wide-character string comparison using collating information✨
wcscpy(3)copy a wide-character string✨
wcscpy(3p)copy a wide-character string, returning a pointer to its end✨
wcscspn(3)search a wide-character string for any of a set of wide characters✨
wcscspn(3p)get the length of a complementary wide substring✨
wcsdup(3)duplicate a wide-character string✨
wcsdup(3p)duplicate a wide-character string✨
wcsftime(3p)convert date and time to a wide-character string✨
wcslen(3)determine the length of a wide-character string✨
wcslen(3p)get length of a fixed-sized wide-character string✨
wcsncasecmp(3)compare two wide-character strings, ignoring case✨
wcsncasecmp(3p)case-insensitive wide-character string comparison✨
wcsncat(3)concatenate two wide-character strings✨
wcsncat(3p)concatenate a wide-character string with part of another✨
wcsncmp(3)compare two fixed-size wide-character strings✨
wcsncmp(3p)compare part of two wide-character strings✨
wcsncpy(3)copy a fixed-size string of wide characters✨
wcsncpy(3p)copy a fixed-size wide-character string, returning a pointer to its end✨
wcsnlen(3)determine the length of a fixed-size wide-character string✨
wcsnlen(3p)get length of a fixed-sized wide-character string✨
wcsnrtombs(3)convert a wide-character string to a multibyte string✨
wcsnrtombs(3p)convert wide-character string to multi-byte string✨
wcspbrk(3)search a wide-character string for any of a set of wide characters✨
wcspbrk(3p)scan a wide-character string for a wide-character code✨
wcsrchr(3)search a wide character in a wide-character string✨
wcsrchr(3p)wide-character string scanning operation✨
wcsrtombs(3)convert a wide-character string to a multibyte string✨
wcsrtombs(3p)convert a wide-character string to a character string (restartable)✨
wcsspn(3)get length of a prefix wide-character substring✨
wcsspn(3p)get the length of a wide substring✨
wcsstr(3)locate a substring in a wide-character string✨
wcsstr(3p)find a wide-character substring✨
wcstod(3p)convert a wide-character string to a double- precision number✨
wcstoimax(3)convert wide-character string to integer✨
wcstoimax(3p)convert a wide-character string to an integer type✨
wcstok(3)split wide-character string into tokens✨
wcstok(3p)split a wide-character string into tokens✨
wcstol(3p)convert a wide-character string to a long integer✨
wcstold(3p)convert a wide-character string to a double-precision number✨
wcstoll(3p)convert a wide-character string to a long integer✨
wcstombs(3)convert a wide-character string to a multibyte string✨