Linux how to remove file security and empty trash

Use the shred command to delete the file completely: use the shred command to overwrite the file content multiple times to ensure that the file is deleted safely. You can use the following commands

shred -u -z -n 5 file_name

empty trash

rm -rf ~/.local/share/Trash/*

use following command to confirm

df -h
du -sh /your_folder

From：Is Everything OK