User`s guide

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nexti [n] Executes the specified number of machine instructions,
stepping over procedures. If you do not provide an
argument, nexti executes one line. If nexti encounters any
breakpoints, even in procedures which it steps over, it
immediately stops execution.
playback input [file]
Executes the commands from file. The default file is the
current temporary file created for the record input command.
If the dbx variable $pimode is nonzero, the commands are
printed out as they are played back.
playback output [file]
Prints the commands from file. The default file is the current
temporary file created for the record output command.
print [exp1 [, exp2, ... ] ]
Prints the value(s) of the specified expression(s).
printd [exp1 [, exp2, ... ] ]
Prints the value(s) of the specified expression(s) in decimal.
printf string [, exp1 [, exp2, ... ] ]
Prints the value(s) of the specified expression(s) in the
format specified by the string, string. The printf command
supports all formats except “%s”. For a list of formats, see
the printf(3S) reference page.
printo [exp1 [, exp2, ... ] ]
Prints the value(s) of the specified expression(s) in octal.
printregs Prints all register values.
printx [exp1 [, exp2, ... ] ]
Prints the value(s) of the specified expression(s) in
hexadecimal.
quit Quits dbx.
record Displays the current input and output recording sessions.
record input [file]
Records everything you type todbx in file. The default file is
a temporary dbx file in the /tmp directory. The name of the
temporary file is stored in the dbx variable $defaultin.