stdbuf manpage

Search topic Section

STDBUF(1)			 User Commands			     STDBUF(1)

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

       stdbuf OPTION... COMMAND

       Run COMMAND,  with  modified  buffering	operations  for	 its  standard

       Mandatory  arguments  to	 long  options are mandatory for short options

       -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

	      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 follow-
       ing: 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' settings.

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

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

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

       Written by Padraig Brady.

       Copyright  (C) 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.

       The  full  documentation	 for stdbuf is maintained as a Texinfo manual.
       If the info and stdbuf 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		 February 2016			     STDBUF(1)