5.7 Making the most of the interactive mode

You may provide more than one command on the same entry, by separating them with a semicolon. For example, it’s often desired to perform a single step and immediately afterwards to examine the CPU state. You can do this with the command

step; read-all-regs

Repetitive action is common when debugging. Fortunately, with µPad it’s not necessary to retype an entire command in order to repeat it. The familiar features found in most modern command shells also work in µPad. These are:

• Command history

  Like most command shells, you can repeat the most recent command using the sequence ‘!!’. Similarly, you can repeat the most recent command beginning with the letters xyz by typing ‘!xyz’.

• History buffer retrieval

  You can scroll through the list of previously executed commands using the key C-p. Similarly you can scroll forward using C-n. If your keyboard has up-down arrow keys these will probably also work.

• Tab Completion

  If you cannot remember the precise orthography of a command, then hitting the Tab key will show you a list of possible completions. For example hitting w and then Tab will show you all the commands which start with the letter ‘w’.