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NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | BUGS | AUTHOR | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
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STDBUF(1) User Commands STDBUF(1)
stdbuf - Run COMMAND, with modified buffering operations for its
standard streams.
stdbuf OPTION... COMMAND
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
tail -f access.log | stdbuf -oL cut -d ' ' -f1 | uniq
This will immediately display unique entries from access.log
On GLIBC platforms, specifying a buffer size, i.e., using fully
buffered mode will result in undefined operation.
Written by Padraig Brady.
GNU coreutils online help:
<https://www.gnu.org/software/coreutils/>
Report any translation bugs to
<https://translationproject.org/team/>
Copyright © 2024 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.
Full documentation
<https://www.gnu.org/software/coreutils/stdbuf>
or available locally via: info '(coreutils) stdbuf invocation'
This page is part of the coreutils (basic file, shell and text
manipulation utilities) project. Information about the project
can be found at ⟨http://www.gnu.org/software/coreutils/⟩. If you
have a bug report for this manual page, see
⟨http://www.gnu.org/software/coreutils/⟩. This page was obtained
from the tarball coreutils-9.5.tar.xz fetched from
⟨http://ftp.gnu.org/gnu/coreutils/⟩ on 2024-06-14. If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to [email protected]
GNU coreutils 9.5 March 2024 STDBUF(1)
Pages that refer to this page: setbuf(3)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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