ext4 with Ubuntu 9.10

I was using Ubuntu 8.10 with ext3 as the file system type. The system performance was somewhat not up to the mark so I decided to install Ubuntu 9.10 with ext4 as the fs type. The overall system performance improved significantly after the installation.

For example: The HUGE folders in thunderbird are now opening much faster than with Ubunti 8.10 + ext3.

Till now i'm impressed with ext4 :)

Average file size within a directory

To calculate the average file size within a directory on a Linux system, following command can be used:

ls -l | gawk '{sum += $5; n++;} END {print sum/n;}'

If you'd like to know the average size of some particular kind of files (like jpg files) then use the following:

ls -l *.jpg | gawk '{sum += $5; n++;} END {print sum/n;}'