Special Attributes on file - use "+" to set permissions and "-" to remove:
Category Command Description
chattr +a file1 allows write opening of a file only append mode
chattr +c file1 allows that a file is compressed / decompressed automatically by the kernel
chattr +d file1 makes sure that the program ignores Dump the files during backup
chattr +i file1 makes it an immutable file, which can not be removed, altered, renamed or linked
chattr +s file1 allows a file to be deleted safely
chattr +S file1 makes sure that if a file is modified changes are written in synchronous mode as with sync
chattr +u file1 allows you to recover the contents of a file even if it is canceled
lsattr show specials attributes