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Linux protect file from deletion

To protect file from deletion in Linux system, the chattr command is able to set the attributes that protects the file.

chattr +a my_protected_file.txt

chattr +a  == means that the file can be appended and the file can't be deleted as well.

To set the file to immutable, "+i"  attribute can be used.

chattr +i the_protected_file.txt

Immutable file is protected from deletion and the original contents of the file is also preserved because no changes can be made.

This command below:

ls xx*.txt >> the_protected_file.txt

The command above will show "permission denied" if the file is immutable.

If the file is set with +a, then the above command will append the output of "ls" to the file.

To unset or removed the attribute use the minus sign, "-a", "-i".

For example, chattr -a the_protected_file.txt or  chattr -i the_protected_file.txt

To know more about chattr type the command below:

man chattr
chattr --help
info chattr


This wiki link shows some nice info as well: https://en.wikipedia.org/wiki/Chattr

To check if the file has attribute settings, follow the example below:

lsattr the_protected_file.txt

The lsattr command will show whether the file or directory has attribute settings.



Cheers. Till next time.


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