From: Herve Eychenne <rv@eychenne.org>

Clean up the script. This also makes it two times faster. (Thanks to
Herve Eychenne.)

- moved variable definitions to the top, for easier configuration
- the script contains bashisms, so make it /bin/bash
- use sed -e'...' -e '...' instead of sed | sed 
- avoid subshells: () changed to {}
- various other minor optimizations and improvements
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>