Minimal prompt

export PS1='$HOSTNAME (${PWD##*/}) | '

Sourcing your config file

Put this line in /.kshrc

Add this line to your /.profile

export ENV=~/.kshrc

This will source your .kshrc

. ~/.kshrc

Incremental search (I-search) interactive search

Press C-r, the shell prompt changes to I-search: and you can start typing the beginning of a command or substring. As you type the shell searches incrementally through your previous commands displaying the closest matches. If the first match isn't what you were looking for, press C-r again to cycle through more matches in reverse order. To execute matched commands press Enter. To edit the matched command before executing it, you can press right or left arrow to exit the search and modiyf the command line. If you want to cancel the search press C-g or C-c