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.

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.

REPORTING BUGS
       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report stdbuf translation bugs to <http://translationproject.org/team/>

COPYRIGHT
       Copyright © 2014 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
       Full documentation at: <http://www.gnu.org/software/coreutils/stdbuf>
       or available locally via: info '(coreutils) stdbuf invocation'



GNU coreutils 8.23                          March 2015                                  STDBUF(1)