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. 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
e.g.) then that will override corresponding settings changed 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 immedidately 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¶
Report stdbuf bugs to bug-coreutils@gnu.org
GNU coreutils home page: <
http://www.gnu.org/software/coreutils/>
General help using GNU software: <
http://www.gnu.org/gethelp/>
Report stdbuf translation bugs to <
http://translationproject.org/team/>
COPYRIGHT¶
Copyright © 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL
version 3 or later <
http://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¶
The full documentation for
stdbuf is maintained as a Texinfo manual. If
the
info and
stdbuf programs are properly installed at your
site, the command
- info coreutils 'stdbuf invocation'
should give you access to the complete manual.