undeletable
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Chattr — is a Linux command that allows a user to set certain attributes on a file. Mostly chattr is used to make files immutable so that password files and certain system files cannot be erased during software upgrades.man|1|chflags|OpenBSD] It is… … Wikipedia
Lsattr — NOTOC lsattr is a command line program for listing the attributes on a Linux second extended file system (ext2). [http://linux.about.com/library/cmd/blcmdl1 lsattr.htm lsattr man] ] It is also a command to display attributes of devices on an AIX… … Wikipedia
chattr — is a command in the Linux operating system that allows a user to set certain attributes on a file residing on an ext2 based filesystem. chflags is the analogous command on modern BSD systems, including Mac OS X. The commands are similar to the… … Wikipedia