How to recover history commands?

Question

I have ran certain commands in korn shell script as follows:

324 pwd
325 list 
326 cd mpiomp 
327 list 
328 cd C 
329 list 
330 history  

How can I retrieve the pwd command by using r ? Currently I am using r -324 but its not working.

Answer 1

The documentation of the r commands shows that you are using it wrong. here are the relevant parts:

The r command (a built-in KornShell alias) re-executes a command you ran previously, possibly editing it first. Commands are obtained from your command history file.

The specifier tells which command you want to re-execute. It can have any of the following forms:

An unsigned number ( n )
Run the command with that number.

A negative number ( -n )
Runs the command that came n commands before the current one.

As you can see, calling the command r 324 will execute the command with that history number.