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STDBUF

Section: User Commands (1)
Updated: July 2014
Index Return to Main Contents
 

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.

GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report stdbuf translation bugs to <http://translationproject.org/team/>  

EXAMPLES

tail -f access.log | stdbuf -oL cut -d aq aq -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.  

COPYRIGHT

Copyright © 2014 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 aqstdbuf invocationaq

should give you access to the complete manual.


 

Index

NAME
SYNOPSIS
DESCRIPTION
EXAMPLES
BUGS
AUTHOR
COPYRIGHT
SEE ALSO


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