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

Provided by: coreutils_9.4-3ubuntu6_amd64

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,R,Q. 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.

Exit status:
125 if the stdbuf command itself fails

126 if COMMAND is found but cannot be invoked

127 if COMMAND cannot be found

- the exit status of COMMAND otherwise

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 © 2023 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.