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The ext2fs allows you to setup several attributes for each file or directory, each attribute modifies the behavior of a file, you can see the current attributes of a file with the lsattr command and you can change the attributes with the chattr command. For example, open a terminal window, then create a new “test” directory:

If you have a file that you want nobody can change it, you shall type the following command into a shell

# sudo chattr +i filename

You can check the attributes using the following command:

# lsattr

----i------------- ./gg1.txt