Chattr

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chattr is a UNIX program that allows a user to set certain attributes to a file. Mostly chattr is used to make files immutable so that password files and certain system files cannot be erased during software upgrades.

The form of the chattr command is:

chattr [-RV] [-+=AacDdijsSu] [-v version] files

where

-R is to recurse all subdirectories
+i is to set the immutable bit to prevent even root from erasing or changing the contents a file (the superuser can't erase or write on the file, but he or she can set or unset the 'i' attribute).

On modern BSD systems (including Mac OS X) the equivalent command is chflags.

  • lsattr view file attributes
  • chown change file/directory ownership
  • chmod change Unix access control attributes
  • cacls MS-Windows NT filesystem ACL control utility
  • attrib available on DOS and other systems

v • d • e
Unix command line programs and builtins (more)
File and file system management alias · cat · chattr · cd · chmod · chown · chgrp · cksum · cmp · cp · du · df · file · fsck · fuser · ln · ls · lsattr · lsof · mkdir · mount · mv · pwd · rm · rmdir · split · touch
Process management at · chroot · crontab · exit · kill · killall · nice · pgrep · pidof · pkill · ps · pstree · sleep · time · top · wait · watch
User management/environment env · finger · id · logname · mesg · passwd · su · sudo · uname · uptime · w · wall · who · whoami · write
Text processing awk · comm · cut · ed · ex · fmt · head · iconv · join · less · more · paste · sed · sort · tac · tail · tr · uniq · wc · xargs
Shell programming basename · echo · expr · false · printf · test · true · unset
Printing: lp · Communications: inetd · netstat · ping · rlogin · nc · traceroute · Searching: find · grep · strings · Miscellaneous: banner · bc · cal · dd · man · size · yes
Retrieved from "http://en.wikipedia.org/wiki/Chattr"
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