TOPS-20 Commands Reference Manual

UNKEEP

Cancels the kept status of a fork.

Format

UNKEEP (FORK) fork

where:

fork is one of the following: Fork name
Fork number
Default - the current fork

Characteristics

Unkept Forks

An unkept fork is a fork that is cleared from memory when another program is loaded or when the RESET command is given. Forks are normally unkept unless kept with the KEEP or SET PROGRAM KEEP commands.

Inferior Forks

The UNKEEP command simultaneously cancels the kept status of a superior fork and its inferior forks.

Hints

More Information

The UNKEEP command is one of the TOPS-20 multiforking-class commands. For more information about multiforking, see the section named Running Multiple Programs in the TOPS-20 User's Guide.

Effect on Memory

The UNKEEP command does not immediately affect memory. It does, however, allow a fork in memory to be cleared when another program is loaded or the RESET command is given.

Related Commands

INFORMATION FORK-STATUS for displaying the fork status
KEEP for changing an unkept fork to a kept fork
RESET for clearing forks from memory
CONTINUE, FORK, FREEZE, KEEP, INFORMATION FORK-STATUS, SET NAME, and SET PROGRAM other multiforking-related commands

Examples

  1. Give the INFORMATION FORK-STATUS command to display the fork status. Then, give the UNKEEP command to cancel the kept status of the current fork and redisplay the fork status. 
    @INFORMATION FORK-STATUS
 => EDIT (1): Kept, HALT at 6254, 0:00:00.6
    FILCOM (2): Kept, ^C from IO wait at 700272, 0:00:00.2
@UNKEEP
@INFORMATION FORK-STATUS
 => EDIT (1): HALT at 6254, 0:00:00.6
    FILCOM (2): Kept, ^C from IO wait at 700272, 0:00:00.2
  2. Display the fork status, and UNKEEP a noncurrent fork. Then, verify the new fork status. 
    @INFORMATION FORK-STATUS
 => EDIT (1): HALT at 6254, 0:00:00.6
    FILCOM (2): Kept, ^C from IO wait at 700272, 0:00:00.2
@UNKEEP FILCOM
@INFORMATION FORK-STATUS
 => EDIT (1): HALT at 6254, 0:00:00.6
    FILCOM (2): ^C from IO wait at 700272, 0:00:00.2