Man1 - sync.1

sync - Synchronize cached writes to persistent storage

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

Persistence guarantees vary per system. See the system calls below for more details.

Written by Jim Meyering and Giuseppe Scrivano.

GNU coreutils online help: https://www.gnu.org/software/coreutils/
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Copyright © 2021 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later https://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.

fdatasync(2), fsync(2), sync(2), syncfs(2)

Full documentation https://www.gnu.org/software/coreutils/sync
or available locally via: info ’(coreutils) sync invocation’