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GNU coreutils 8.32
March 2020

coreutils

The basic file, shell and text manipulation utilities of the GNU operating system

coreutils-common

coreutils common optional components

coreutils-doc

Documentation for the GNU Core Utilities

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 \(aq \(aq -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 © 2020 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 \(aq(coreutils) stdbuf invocation\(aq

REFERENCED BY

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