stdbuf

STDBUF(1)                        User Commands                       STDBUF(1)

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

EXAMPLES
       tail -f access.log | stdbuf -oL cut -d ' ' -f1 | uniq
       This will immediately 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: <https://www.gnu.org/software/coreutils/>
       Report   stdbuf   translation    bugs    to    <https://translationpro-
       ject.org/team/>

COPYRIGHT
       Copyright  (C) 2018 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.

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

GNU coreutils 8.30              September 2019                       STDBUF(1)