TOPS-20 Commands Reference Manual

DETACH

Disconnects your job from your terminal.

Format

@DETACH (AND) argument

where:

argument

can be one of these:

CONTINUE	directs the current program to proceed, just as if you had typed the CONTINUE command.
REENTER	reenters the current program, just as if you had typed the REENTER command.
START	starts the current program, just as if you had typed the START command.
Default	the program is left in its present state

Characteristics

Effects of Detached Jobs

Detached jobs use scarce system resources (such as swapping space, process slots, job slots) and can prevent new users from logging in.

Warning

Programs Writing to the Controlling Terminal (Device TTY:)

If a program running in a detached job attempts to write to device TTY:, the job will wait until it is again attached to a terminal.

Effect on Terminal

The DETACH command leaves your terminal detached from the system in the state before log-in.

If the system manager enables the hangup-on-DETACH feature, then if a user DETACHes from a DECSYSTEM-20, the system hangs up the terminal line that user was connected to. The job still remains detached, but the user no longer retains a terminal line.

Related Commands

ATTACH	for joining a detached job to your terminal
SYSTAT	for finding out which jobs are detached
SUBMIT	for running independent jobs
UNATTACH	for disengaging another job from its terminal

Examples

Detach your job.
```
@DETACH
Detaching job # 16
```

Detach your job while starting the program in memory, then log in again.

@DETACH START
 Detaching job # 45

 BOSTON, TOPS-20 Development System, TOPS-20 Monitor 7(21002)
@LOGIN LATTA 341

Log in and put a program in memory; detach the job while starting this program, and repeat the entire procedure. Log in a third time and begin execution of a third program. Interrupt this execution with CTRL/C, then detach this third job while continuing its program. Now you have three jobs running at once. Instead of logging in again, attach the first job (specifying the job number) and verify the system's action.

@LOGIN LATTA 341
 Job 5 on TTY230 26-Mar-87 14::09, Last Login 26-Mar-87 11:36:12

@GET DMN
@DETACH START
 Detaching job # 5

 BOSTON, TOPS-20 Development System, TOPS-20 Monitor 7(21002)
@LOGIN LATTA 341
 Job 22 on TTY222 26-Mar-87 14:42:03, Last Login 26-Mar-87 14:38:09
@GET TESTA1
@DETACH START
 Detaching job # 22

 BOSTON, TOPS-20 Development System, TOPS-20 Monitor 7(21002)
@LOGIN LATTA 341
 Job 53 on TTY222 26-Mar-87 14:44:02, Last Login 26-Mar-87 14:42:03

@EXECUTE TESTF1
FORTRAN: TESTF1
MAIN.
LINK:   Loading
[LNKXCT  TESTF1 Execution]
^C

@DETACH CONTINUE
 Detaching job # 53

 BOSTON, TOPS-20 Development System, TOPS-20 Monitor 7(21002)
@ATTACH LATTA
  Job 22, Detached, Running DETACH
  Job 53, Detached, Running DETACH
Job: 5
Password:___

EXIT
@SYSTAT LATTA
   5*   222   EXEC      LATTA
  22    DET   TESTA1    LATTA
  53    DET   TESTF1    LATTA

Navigation

Topics