sync

Flush all pending write operations on all disks

$ sync

Flush all pending write operations on a single file to disk

$ sync [path/to/file]

sync [ OPTION ][ FILE ]...

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

GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
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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

Copyright 2019 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 sync invocation

Written by Jim Meyering and Giuseppe Scrivano.