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  man pages->Tru64 Unix man pages -> nohup (1)              



NAME    [Toc]    [Back]

       nohup - Runs a utility ignoring hangups and quits

SYNOPSIS    [Toc]    [Back]

       nohup utility [argument...]


       The  C shell  has a built-in version of the nohup command.
       If you are using the C shell, and want to  guarantee  that
       you are using the command described here, you must specify
       the full path /usr/bin/nohup.  See  the  csh(1)  reference
       page for a description of the built-in command.

STANDARDS    [Toc]    [Back]

       Interfaces  documented  on  this reference page conform to
       industry standards as follows:

       nohup:  XCU5.0

       Refer to the standards(5) reference page for more information
 about industry standards and associated tags.

OPTIONS    [Toc]    [Back]


OPERANDS    [Toc]    [Back]

       The  name  of a command to be invoked.  Optional arguments
       required by the utility specified for invokation.

DESCRIPTION    [Toc]    [Back]

       The nohup command runs utility, ignoring all  hangups  and
       QUIT signals.  You can use this command to run programs in
       the background after logging off the  system.   To  run  a
       nohup  command  in the background, add an & (ampersand) to
       the end of the command.

       If nohup output is redirected to  a  terminal  or  is  not
       redirected  at  all,  the  output  is appended to the file
       nohup.out.  If the file is created,  the  permission  bits
       are  set to Owner Read and Owner Write (600). If nohup.out
       is not writable in the current directory,  the  output  is
       redirected  to  $HOME/nohup.out.   If  neither file can be
       created nor opened for appending, utility is not  invoked.

       If  standard  error  is  a terminal, all output written to
       standard error is appended to the file receiving  standard

       The nohup command accepts just one utility as an argument.
       To apply nohup to a pipeline or list  of  commands,  enter
       the  pipeline or list in a shell script file.  Then run sh
       as utility using the following format: nohup sh -c file

       [Tru64 UNIX]  You can also assign the shell  file  execute
       permission  and  run  it as the utility in the form: nohup

NOTES    [Toc]    [Back]

       The term utility, rather than the term command,  describes
       the  argument  to  nohup  because shell compound commands,
       pipelines, special built-in programs, and the like, cannot
       be   handled  directly.  In  addition,  the  term  utility
       includes user application programs and shell scripts,  not
       just the standard utilities.

EXIT STATUS    [Toc]    [Back]

       The  nohup  command returns the following exit values: The
       specified utility was found, but  could  not  be  invoked.
       The  error  occurred in the nohup utility or the specified
       utility could not be found.

       The exit status is otherwise that of the utility.

EXAMPLES    [Toc]    [Back]

       To leave a command running after logging  out  (sh  only),
       enter: nohup  find  /  -print  &

              Shortly after you enter this, the following is displayed:
 670 $ Sending output to nohup.out

              The process ID number  changes  to  the  background
              process started by the & (ampersand), in this case,
              670.  The $ (dollar sign) is the shell prompt.  The
              message  following informs you that the output from
              the find command is in the file nohup.out.  Sending

              You  can log out after you see these messages, even
              if the find command has not finished yet.

              If you are using csh, the built-in command nohup is
              executed instead of the system command.  To execute
              the nohup system command, you must enter  an  absolute
  path.  To do the same, but redirect the standard
 output to a different file, enter: nohup  find
              /  -print  >filenames  &

              This runs the find command and stores its output in
              a file named filenames. Now only the process ID and
              prompt are displayed.

              Wait  for  a  second  or  two  before  logging out,
              because the nohup command takes a moment  to  start
              the  command  you  specified.  If  you  log out too
              quickly, utility may not run at all.  Once  utility
              has  started,  logging  out does not affect it.  To
              run more than one command, use a shell script.  For
              example, if you include the following shell script:
              comm -23 fi4 fi5 | comm -23 - fi6 | join -a1 -  fi7
              > comm.out

              and name it ncomm, you can run nohup for all of the
              commands in ncomm by entering: nohup sh ncomm

              If you assign ncomm  Execute  permission,  you  can
              obtain  the  same  results  by issuing the command:
              nohup ncomm

              To run this command in the background, enter: nohup
              ncomm &


       The  following  environment variables affect the execution
       of nohup: Provides a default value for the  internationalization
 variables that are unset or null. If LANG is unset
       or null, the corresponding value from the  default  locale
       is  used.   If  any  of the internationalization variables
       contain an invalid setting, the utility behaves as if none
       of  the variables had been defined.  If set to a non-empty
       string value, overrides the values of all the other internationalization
  variables.  Determines the locale for the
       interpretation of sequences of bytes of text data as characters
  (for  example, single-byte as opposed to multibyte
       characters in arguments).  Determines the locale  for  the
       format  and  contents  of  diagnostic  messages written to
       standard error.  Determines the location of message  catalogues
  for the processing of LC_MESSAGES.  Determines the
       search path that will be used to locate the command to  be

FILES    [Toc]    [Back]

       Standard output and standard error file for nohup.

SEE ALSO    [Toc]    [Back]

       Commands:  csh(1),  ksh(1),  nice(1), Bourne shell sh(1b),
       POSIX shell sh(1p)

       Functions:  sigaction(2)

       Standards:  standards(5)

[ Back ]
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