Chattr

chattr is a command in the Linux operating system that allows a user to set certain attributes on a file residing on many Linux filesystems. chflags is the analogous command on modern BSD systems, including OS X. The commands are similar to the attrib command on DOS, OS/2 and Microsoft Windows. Other Unix systems have no analogous commands; Solari...
Found on http://en.wikipedia.org/wiki/Chattr

chattr

Change file attributes.
Found on http://www.tldp.org/LDP/intro-linux/html/gloss.html
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