The options are as follows:
Flags are a comma separated list of keywords. The following keywords are currently defined:
arch set the archived flag (super-user only)
opaque set the opaque flag (owner or super-user only)
nodump set the nodump flag (owner or super-user only)
sappnd set the system append-only flag (super-user only)
schg set the system immutable flag (super-user only)
uappnd set the user append-only flag (owner or super-user only)
uchg set the user immutable flag (owner or super-user only)
Putting the letters ``no'' before an option causes the flag to be turned off. For example:
nouchg the immutable bit should be cleared
The -H, -L and -P options are ignored unless the -R option is specified. In addition, these options override each other and the command's actions are determined by the last one specified.
The -o option of ls(1) is used to display the flags.
The chflags utility exits 0 on success, and >0 if an error occurs.
The kernel does not allow the flags on block and character devices to be changed except by the super-user.