stdbuf - Run COMMAND, with modified buffering operations for its standard streams.

       Written by Padraig Brady.

       On GLIBC platforms, specifying a buffer size, i.e., using fully buffered mode will  result  in  undefined
       operation.

       Copyright  ©  2024  Free  Software  Foundation,  Inc.   License  GPLv3+:  GNU  GPL  version  3  or  later
       <https://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to  the  extent
       permitted by law.

       Run COMMAND, with modified buffering operations for its standard streams.

       Mandatory arguments to long options are mandatory for short options too.

       -i, --input=MODE
              adjust standard input stream buffering

       -o, --output=MODE
              adjust standard output stream buffering

       -e, --error=MODE
              adjust standard error stream buffering

       --help display this help and exit

       --version
              output version information and exit

       If  MODE  is  'L'  the  corresponding stream will be line buffered.  This option is invalid with standard
       input.

       If MODE is '0' the corresponding stream will be unbuffered.

       Otherwise MODE is a number which may be followed by one of the following: KB 1000, K 1024, MB  1000*1000,
       M  1024*1024,  and so on for G,T,P,E,Z,Y,R,Q.  Binary prefixes can be used, too: KiB=K, MiB=M, and so on.
       In this case the corresponding stream will be fully buffered with the buffer size set to MODE bytes.

       NOTE: If COMMAND adjusts the buffering of its standard streams ('tee' does for example)  then  that  will
       override  corresponding  changes  by  'stdbuf'.   Also  some filters (like 'dd' and 'cat' etc.) don't use
       streams for I/O, and are thus unaffected by 'stdbuf' settings.

   Exitstatus:
       125    if the stdbuf command itself fails

       126    if COMMAND is found but cannot be invoked

       127    if COMMAND cannot be found

       -      the exit status of COMMAND otherwise

tail-faccess.log|stdbuf-oLcut-d''-f1|uniq
       This will immediately display unique entries from access.log

       stdbuf - Run COMMAND, with modified buffering operations for its standard streams.

       GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
       Report any translation bugs to <https://translationproject.org/team/>

       Full documentation <https://www.gnu.org/software/coreutils/stdbuf>
       or available locally via: info '(coreutils) stdbuf invocation'

GNU coreutils 9.5                                  April 2025                                          STDBUF(1)

stdbufOPTION... COMMAND