ACL Linux

sudo chattr +i log.txt - make it unremovable
lsattr log.txt - to check for the attribute {
In normal files -> `e` attribute
in unremovable -> `i` attribute
`a` - you cannot edit the data, but you can extend the data (to put something new in the file)
}
sudo chattr -i log.txt - to remove the attribute


Sticky bit
ls -l /tmp
rwx rwx rwt -t sticky bit - Unless you have 'w' right you cannot remove and edit the files of different users if you aren't root