sync

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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