stdbuf(1) — Linux manual page


STDBUF(1)                       User Commands                      STDBUF(1)

NAME         top

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

SYNOPSIS         top

       stdbuf OPTION... COMMAND

DESCRIPTION         top

       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
       following: KB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for
       G, T, P, E, Z, Y.  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.

EXAMPLES         top

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

BUGS         top

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

AUTHOR         top

       Written by Padraig Brady.

REPORTING BUGS         top

       GNU coreutils online help: <>
       Report any translation bugs to <>

COPYRIGHT         top

       Copyright © 2020 Free Software Foundation, Inc.  License GPLv3+: GNU
       GPL version 3 or later <>.
       This is free software: you are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO         top

       Full documentation <>
       or available locally via: info '(coreutils) stdbuf invocation'

COLOPHON         top

       This page is part of the coreutils (basic file, shell and text
       manipulation utilities) project.  Information about the project can
       be found at ⟨⟩.  If you have a
       bug report for this manual page, see
       ⟨⟩.  This page was obtained
       from the tarball coreutils-8.32.tar.xz fetched from
       ⟨⟩ on 2020-07-14.  If you discover
       any rendering problems in this HTML version of the page, or you
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       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail

GNU coreutils 8.32               March 2020                        STDBUF(1)

Pages that refer to this page: setbuf(3)setbuffer(3)setlinebuf(3)setvbuf(3)