change file flags
chflags utility modifies the file
flags of the listed files as specified by the flags
operand. The flags of a file dictate special
restrictions beyond those enforced by its mode/permissions. Only the
superuser can change the user flags on block and character devices.
You can use
-lo to see the flags of existing files.
The options are as follows:
- If the
-Roption is also specified, symbolic links on the command line are followed. Symbolic links encountered in the tree traversal are not followed.
- Treat symbolic links like other files: modify links instead of following
-Roptions are mutually exclusive.
- If the
-Roption is also specified, all symbolic links are followed.
- If the
-Roption is also specified, no symbolic links are followed.
- Recurse. Where file is a directory, change the flags of the directory and all the files and directories in the file hierarchy below it.
Flags are a comma separated list of keywords. The following keywords are currently defined:
- set the archived flag (superuser only)
- set the nodump flag (owner or superuser only)
- set the system append-only flag (superuser only)
- set the system immutable flag (superuser only)
- set the user append-only flag (owner or superuser only)
- set the user immutable flag (owner or superuser only)
arch flag is for compatibility only,
and currently has no effect.
A file with the
nodump flag set will by
default only be backed up by
dump(8) during full backups. The
-h option of
dump(8) can be used to alter this.
An immutable file may not be changed, moved, or deleted. An append-only file is immutable except that data may be appended to it.
schg flags can be set at any time, but may only be
cleared when the system is running at security level 0 or -1 (insecure or
permanently insecure mode, respectively). For more information on setting
the system security level, see
Putting the letters
no before a flag name
causes the flag to be turned off. For example:
- the immutable bit should be cleared
-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
chflags utility exits 0 on
success, and >0 if an error occurs.
ls(1), chflags(2), stat(2), fts_open(3), securelevel(7), symlink(7), dump(8)
chflags command first appeared in