Dbx 1024 User's Guide download pdf (Page 36)

Chapter 4: Controlling dbx

Examining the History List

dbx stores all commands that you enter in the history list. The value of the

dbx variable $lines determines how many commands are stored in the history

list. The default value is 100.

Display the history list with the history command. For example, after setting

a breakpoint, running a program, and examining some variables, your

history list might look something like this:

(dbx) history

1 set $prompt = “(dbx)”

2 set $page=0

3 set $pimode=1

4 stop in main

5 history

Repeating Commands

You can execute any of the commands contained in the history list. Each

history command begins with an exclamation point (!):

!! Repeats the previous command. If the value of the dbx

variable $repeatmode is set to 1, then entering a carriage

return at an empty line is equivalent to executing !!. By

default, $repeatmode is set to 0.

!string Repeats the most recent command that starts with the

speciﬁed string.

!integer Repeats the command associated with the speciﬁed integer

in the history list.

!-integer Repeats the command that occurred integer times before the

most recent command. Entering !-1 executes the previous

command, !-2 the command before that, and so forth.

You can use the !! command to facilitate single-stepping through your

program. (Single-stepping is described in “Stepping Through Your

Program” on page 78.) The following illustrates using the next command to

execute 5 lines of source code and then using the !! command to repeat the

next command.

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 157 158

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Dbx 1024 User's Guide Page 36