For those of you suffering of typing all the commands again for every new release it might be interesting to use the shell "bash" with its comfortable history (instead of built in standard ash ):

In your phone in a shell (as root!) type the following:
and then type /bin/bash
This is for the standard user (which has the username "user").
For the root-Shell do the same without username:
and then type /bin/bash

For convinience edit/create the files
/home/user/.bash_profile and /root/.bash_profile
and add the following lines

HISTCONTROL=ignoreboth
HISTSIZE=2000

Thats it, next time starting a shell you will have bash command line. From than on the shell remembers your used commands (not starting with a space!) since the last logout and you can search them with CTRL-r .

I find this quite helpful and the idea came up during last maemo user meeting Berlin and is based on tips from c-base residents "lynxs" an "T" . Thanks again guys!