Emacs Ediff Lose Focus

This seems to happen in emacs-21 and emacs-22, when I type next in the control panel, the cursor focus changes from control panel to one of the emacs diff buffers. I am not sure if this is relate to window manager (xfce) or emacs configuration. I have to change to it 'always on top' to fix the problem.

How to Undelete a Removed File on a NTFS File System

This is the instruction to recover a deleted file on a NTFS partition mounted on Linux. For windows, there are commerical software you can use to do the undelete. But if you have a Linux partition installed on your computer, you can recover/undelete the file in the NTFS partition under Linux for free.

To recover a deleted file on a NTFS partition use ntfsundelete (yum install ntfsprogs). For example, to recover abc.xls. First check the file deleted within a day (assume you deleted the file today, then recover the file with inode specified(in this case 106).

# ntfsundelete /dev/sda5 -t 1d
Inode    Flags  %age  Date           Size  Filename
---------------------------------------------------------------
106      FN..   100%  2008-10-14     14848  
4477     FN..   100%  2008-10-14     14848  

Files with potentially recoverable content: 2

# ntfsundelete /dev/sda5 -u -i 106 -o abc.xls
Inode    Flags  %age  Date            Size  Filename
---------------------------------------------------------------
106      FN..     0%  2008-10-14     14848  

Undeleted '(null)' successfully.

Also see instruction for undeleting a file on an ext3 file system.

How to Undelete a Removed File on an ext3 File System

If you accidentally delete a file on ext3, you can recover it using ext3grep. Below is an example where I am trying to restore the file test/tt.

# ext3grep  --dump-names /dev/sda10
Running ext3grep version 0.8.0
WARNING: I don't know what EXT3_FEATURE_COMPAT_EXT_ATTR is.
WARNING: EXT3_FEATURE_INCOMPAT_RECOVER is set. This either means that your partition is still mounted, and/or the file system is in an unclean state.
Number of groups: 258
Minimum / maximum journal block: 1546 / 35888
Loading journal descriptors... sorting... done
....

test
test/.tt.swp
test/tt

# ext3grep  --restore-file 'test/tt' /dev/sda10
Running ext3grep version 0.8.0
WARNING: I don't know what EXT3_FEATURE_COMPAT_EXT_ATTR is.
WARNING: EXT3_FEATURE_INCOMPAT_RECOVER is set. This either means that your partition is still mounted, and/or the file system is in an unclean state.
Number of groups: 258
Loading group metadata... done
Minimum / maximum journal block: 1546 / 35888
Loading journal descriptors... sorting... done
The oldest inode block that is still in the journal, appears to be from 1223927674 = Mon Oct 13 13:54:34 2008
Number of descriptors in journal: 25686; min / max sequence numbers: 198274 / 210642
Writing output to directory RESTORED_FILES/
Loading sda10.ext3grep.stage2... done
Restoring test/tt
# cat RESTORED_FILES/test/tt 
abc

Also see instruction on how to undelete a file on NTFS partition.

Also, you can try foremost and scalpel packages.

How to Undelete a File on Reiserfs and XFS

There are more work to recover a file on Reiserfs and XFS than either NTFS or ext3.

For reiserfs, see http://antrix.net/journal/techtalk/reiserfs_data_recovery_howto.comments

For xfs, see http://linuxwebdev.blogspot.com/2005/06/xfs-undelete-howto-how-to-undelete.html

Apache2 and Lighttpd

Which one should I use? Use lighttpd for static content like .html and apache for dynamic content like php.

Static Contents:
In my testing, lighttpd (1.4.19) can support at least 1.5 times as many connectoins as apache2 (2.2.9) could.

Dynamic Contents:
With php, they are about the same.

Configurations:
I found apache2 easier to configure than lighttpd. Compression support is better with apache2 than lighttpd.