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Shell Programming and Scripting
Dialog with an external program using named pipes
Post 302858789 by RudiC on Tuesday 1st of October 2013 11:50:15 AM
10-01-2013
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LEARN ABOUT POSIX
stdbuf
STDBUF(1) User Commands STDBUF(1) 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 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 ' ' -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: <http://www.gnu.org/software/coreutils/> Report stdbuf translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 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
Full documentation at: <http://www.gnu.org/software/coreutils/stdbuf> or available locally via: info '(coreutils) stdbuf invocation' GNU coreutils 8.28 January 2018 STDBUF(1)