sync (GNU coreutils) 8.25 Copyright (C) 2016 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. Written by Jim Meyering and Giuseppe Scrivano.

Usage: sync [OPTION] [FILE]... Synchronize cached writes to persistent storage If one or more files are specified, sync only them, or their containing file systems. -d, --data sync only file data, no unneeded metadata -f, --file-system sync the file systems that contain the files --help display this help and exit --version output version information and exit GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Full documentation at: <http://www.gnu.org/software/coreutils/sync> or available locally via: info '(coreutils) sync invocation'