User`s guide

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file [file] Changes the current source file to file. The new file becomes
the current source file, on which you can search, list, and
perform other operations.
func Displays the name of the procedure corresponding to the
current activation level.
func {activation_level | procedure}
Changes the current activation level. If you specify an
activation level by number, dbx changes to that activation
level. If you specify procedure,dbx changes to the activation
level of that procedure. If you specify a procedure name and
that procedure has called itself recursively, dbx changes to
the most recently called instance of that procedure. If you
specify procedure, dbx changes the current source file to be
that procedure, even if the procedure is not active.
givenfile [file]
If you provide a filename, dbx kills the currently running
processes and loads the executable code and debugging
information found in file.
If you do not provide a filename, dbx displays the name of
the program that it is currently debugging.
goto line Begins execution at the specified line. You may not use the
goto command to resume execution with a line outside of
the current procedure.
hed Edits only the last line of the history list (the last command
executed).
hed num1 Edits line num1 in the history list.
hed num1,num2
Edits the lines in the history list from num1 to num2.
hed all Edits the entire history list.
help Shows the list of available help sections.
help all Displays the entire dbx help file. dbx displays the file using
the command name given by the dbx $pager variable. The
dbx help file is large and can be difficult to use if you use a
simple paging program like more(1). A useful technique is to
set the $pager variable to a text editor like vi(1).