nohup(1)                                                 nohup(1)



     NAME
          nohup - run a command immune to hangups

     SYNOPSIS
          nohup command [arguments]

     DESCRIPTION
          nohup executes command immune to terminate (EOT, CONTROL-D)
          signal from the controlling terminal.

             Note:  nohup only operates in csh(1) and sh(1)).


          With nohup, the priority is automatically incremented by 5.
          nohup should be used with processes running in background
          (with &) in order to prevent them from responding to inter-
          rupts or stealing the input from the next person who logs in
          on the same terminal.  In csh, processes run in the back-
          ground are automatically immune to hangups.

          If output is not redirected by the user, both the standard
          output and standard error are sent to a file named
          nohup.out.  If nohup.out is not writable in the current
          directory, output is redirected to $HOME/nohup.out.

     EXAMPLES
             nohup  nroff -mm  docsfile | lp

          runs the nroff command shown, immune to hangups, quits, and
          interrupts.

          It is frequently desirable to apply nohup to pipelines or
          lists of commands.  This can be done only by placing pipe-
          lines and commands lists in a single file, called a shell
          procedure.  One can then issue:

             nohup sh file

          and the nohup applies to everything in file.  If the shell
          procedure file is to be executed often, then the need to
          type sh can be eliminated by giving file execute permission.
          Add an ampersand and the contents of file are run in the
          background with interrupts also ignored (see sh(1) and
          ksh(1)):

             nohup file &

          An example of what the contents of file could be is:

             tbl ofile | eqn | nroff > nfile





     April, 1990                                                     1

     nohup(1)                                                 nohup(1)



     FILES
          /bin/nohup
          nohup.out   standard output and standard error file.

     SEE ALSO
          chmod(1), csh(1), ksh(1), nice(1), sh(1), nice(2), sig-
          nal(3).

     WARNINGS
          nohup command1; command2
               nohup applies only to command1

          nohup (command1; command2)
               is syntactically incorrect.

          Be careful of where standard error is directed.  The follow-
          ing command may put error messages on disk, making it un-
          readable:

             nohup cpio -o < list > /dev/dsk/c8d0s0 2>&1 &

          while the next command:

             nohup cpio -o < list > /dev/dsk/c8d0s0 2>errors &

          puts the error messages into the file errors.





























     2                                                     April, 1990