STDBUF(1)                                 User Commands                                 STDBUF(1)



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

SYNOPSIS
       stdbuf OPTION... COMMAND

DESCRIPTION
       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.  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 e.g.)  then
       that  will  override  corresponding settings changed by 'stdbuf'.  Also some filters (like
       'dd' and 'cat' etc.) don't use streams for I/O, and are thus unaffected by  'stdbuf'  set-
       tings.

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report stdbuf transla-
       tion bugs to <http://translationproject.org/team/>

EXAMPLES
       tail -f access.log | stdbuf -oL cut -d ' ' -f1 | uniq
       This will immedidately display unique entries from access.log

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

AUTHOR
       Written by Padraig Brady.

COPYRIGHT
       Copyright  }  2013  Free  Software  Foundation, Inc.  License GPLv3+: GNU GPL version 3 or
       later <http://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.

SEE ALSO
       The full documentation for stdbuf is maintained as a Texinfo manual.  If the info and std-
       buf programs are properly installed at your site, the command

              info coreutils 'stdbuf invocation'

       should give you access to the complete manual.



GNU coreutils 8.22                         October 2018                                 STDBUF(1)