Force changed blocks to disk, update the super block.
--help display this help and exit
output version information and exit
Written by Jim Meyering.
Report sync bugs to firstname.lastname@example.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
Report sync translation bugs to <http://translationproject.org/team/>
Copyright (C) 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.
The full documentation for sync is maintained as a Texinfo manual. If
the info and sync programs are properly installed at your site, the
info coreutils 'sync invocation'
should give you access to the complete manual.
GNU coreutils 8.12.197-032bb September 2011 SYNC(1)
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