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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.  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

       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 any translation bugs to <https://translationproject.org/team/>


COPYRIGHT

       Copyright (C) 2022 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 <https://www.gnu.org/software/coreutils/stdbuf>
       or available locally via: info '(coreutils) stdbuf invocation'

GNU coreutils 9.1                 April 2022                         STDBUF(1)

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