xen*_*ide 3 linux filesystems permissions xattr
什么是a
在chattr +ia <filename>
做什么?为什么要a
在组合中添加i
?注意:我知道i
是不可变的
Run Code Online (Sandbox Code Playgroud)The letters `acdeijstuADST' select the new attributes for the files: append only (a), compressed (c), no dump (d), extent format (e), immutable (i), data journalling (j), secure deletion (s), no tail-merg? ing (t), undeletable (u), no atime updates (A), synchronous directory updates (D), synchronous updates (S), and top of directory hierarchy (T).
带有此标志的文件将无法打开写入。这也会阻止某些具有潜在破坏性的系统调用,例如truncate()
或unlink()
。
$ touch foo
$ chattr +a foo
$ python
> file("foo", "w") #attempt to open for writing
[Errno 1] Operation not permitted: 'foo'
> quit()
$ truncate foo --size 0
truncate: cannot open `foo' for writing: Operation not permitted
$ echo "Appending works fine." >> foo
$ cat foo
Appending works fine.
$ rm foo
rm: cannot remove `foo': Operation not permitted
$ chattr -a foo
$ rm foo
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