Library /sys$common/syshlp/dbg$help.hlb DEBUG, STEP, Examples  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    1.DBG> SHOW STEP
      step type: source, nosilent, by line,
                 over routine calls
      DBG> STEP
      stepped to SQUARES$MAIN\%LINE 4
           4:         OPEN(UNIT=8, FILE='DATAFILE.DAT', STATUS='OLD')
      DBG>

      In this example, the SHOW STEP command identifies the default
      qualifiers currently in effect for the STEP command. In this
      case, the STEP command, without any parameters or qualifiers,
      executes the next line of source code. After the STEP command
      has completed, execution is suspended at the beginning of line
      4.

    2.DBG> STEP 5
      stepped to MAIN\%LINE 47
          47:         SWAP(X,Y);
      DBG>

      This command executes the next 5 lines of source code. After
      the STEP command has completed, execution is suspended at the
      beginning of line 47.

    3.DBG> STEP/INTO
      stepped to routine SWAP
          23: procedure SWAP (A,B: in out integer) is
      DBG> STEP
      stepped to MAIN\SWAP\%LINE 24
          24:    TEMP: integer := 0;
      DBG> STEP/RETURN
      stepped on return from MAIN\SWAP\%LINE 24 to MAIN\SWAP\%LINE 29
          29: end SWAP;
      DBG>

      In this example, execution is paused at a call to routine
      SWAP, and the STEP/INTO command executes the program up to
      the beginning of the called routine. The STEP command executes
      the next line of source code. The STEP/RETURN command executes
      the rest of routine SWAP up to its RET instruction (that is,
      up to the point just prior to transferring control back to the
      calling routine).