sync - is used to synchronize the data of the temporary memory to the permanent storage memory
syntax $ sync [option] [file]
To sync all the cached files to the permanent memory which belongs to the current user $ sudo sync
To sync only file data, no unneeded metadata $ sudo sync -d /home/ilugc/file1.txt
To sync all the files in dir $ sudo sync -f /home/ilugc/Downloads
To sync the cache data of the mounted partition $ sudo sync /dev/vda1 $ sudo sync /var/log/syslog
regards, T.Dhanasekar