bash is your default shell.
Usually, pressing the <up> key will cause the last command to be shown, no matter what you typed so far. However, many users find it more practical to only past commands that begin with the current input.
Consider this list of commands:
Usually, when typing 'ls' and pressing <up>, your current input will be replaced with man mount. If you are using history seach, only past commands beginning with 'ls' (the current input) will be shown, in this case 'ls /usr/src/linux-2.6.15-ARCH/kernel/power/Kconfig'.
You can enable this mode by adding to /etc/inputrc or your ~/.inputrc
Many tutorials are available on the net. Here are some of them: