[wplug] File Permissions

[Bill]

>From chattr man page:

ATTRIBUTES
       When a file with the 'A' attribute set is modified, its atime
record is not modified.  This avoids a certain  amount  of
       disk I/O for laptop systems.

       A file with the `a' attribute set can only be open in append mode
for writing.  Only the superuser can set or clear this
       attribute.

       A file with the `c' attribute set is automatically compressed on
the disk by the kernel. A read from this  file  returns
       uncompressed data. A write to this file compresses data before
storing them on the disk.

       A file with the `d' attribute set is not candidate for backup
when the dump(8) program is run.

       A  file  with the `i' attribute cannot be modified: it cannot be
deleted or renamed, no link can be created to this file
       and no data can be written to the file. Only the superuser can
set or clear this attribute.

       A file with the `j' attribute has all of its data written to the
ext3 journal before being written to the  file  itself,
       if  the  filesystem is mounted with the "data=ordered" or
"data=writeback" options.  When the filesystem is mounted with
       the "data=journalled" option all file data is already journalled
and this attribute has no effect.

       When a file with the `s' attribute set is deleted, its blocks are
zeroed and written back to the disk.

       When a file with the `S' attribute set is modified, the changes
are written synchronously on the disk; this  is  equiva-
       lent to the `sync' mount option applied to a subset of the files.

       A  file  with  the  't' attribute will not have a partial block
fragment at the of the file merged with other files (for
       those filesystems which support tail-merging).  This is necessary
for applications such as LILO which read the  filesys-
       tem directly, and who don't understand tail-merged files.

       When  a file with the `u' attribute set is deleted, its contents
are saved.  This allows the user to ask for its undele-
       tion.


On Thu, 2003-04-03 at 11:21, Weber, Larry A wrote:
> Can anyone explain what an "s" file permission is, and how it differs from
> "x"?  The man page for chmod isn't very helpful.
> 
> -laweber
> 
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