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DETACH command

The DETACH command 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  (e.g.,  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

     1.  Detach your job.

         @DETACH
         Detaching job # 16

     2.  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

     3.  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