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Is there a way to configure dbx to handle an empty command as a replay of the last command?

In gdb, if I just hit return, it repeats the last command. Is there a way to configure Sun / Oracle / Solaris dbx to do the same?

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You can get this behavior by turning on the "gdb" mode in dbx.

(dbx) gdb on
(dbx) step
stopped in main at line 4 in file "t.c"
    4       printf("world");
(dbx) 
step
stopped in main at line 5 in file "t.c"
    5       printf("!");
(dbx) 
step
stopped in main at line 6 in file "t.c"
    6       printf("\n");
(dbx) 
step
helloworld!
stopped in main at line 7 in file "t.c"
    7   }

Here is the help for gdb mode from the latest dbx version.

(dbx) help gdb
gdb (command)
gdb on | off
Use `gdb on 'to enter the gdb command mode under which dbx will understand
and accept gdb commands. To exit the gdb command mode and return to the dbx
command mode, enter "gdb off". Please note that the dbx commands will not
be accepted while in gdb command mode and vice versa.  All debugging settings
such as breakpoints are preserved  across different command modes. The
following gdb commands are not supported in the current release:
        - commands      - define
        - handle        - hbreak
        - interrupt     - maintenance
        - printf        - rbreak
        - return        - signal
        - tcatch        - until
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, $repeatmode . dbx-guide

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.

"gdb on", dbx , gdb. , dbx , , .

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