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coreutils: nohup invocation

 
 23.4 ‘nohup’: Run a command immune to hangups
 =============================================
 
 ‘nohup’ runs the given COMMAND with hangup signals ignored, so that the
 command can continue running in the background after you log out.
 Synopsis:
 
      nohup COMMAND [ARG]...
 
    If standard input is a terminal, redirect it so that terminal
 sessions do not mistakenly consider the terminal to be used by the
 command.  Make the substitute file descriptor unreadable, so that
 commands that mistakenly attempt to read from standard input can report
 an error.  This redirection is a GNU extension; programs intended to be
 portable to non-GNU hosts can use ‘nohup COMMAND [ARG]... 0>/dev/null’
 instead.
 
    If standard output is a terminal, the command’s standard output is
 appended to the file ‘nohup.out’; if that cannot be written to, it is
 appended to the file ‘$HOME/nohup.out’; and if that cannot be written
 to, the command is not run.  Any ‘nohup.out’ or ‘$HOME/nohup.out’ file
 created by ‘nohup’ is made readable and writable only to the user,
 regardless of the current umask settings.
 
    If standard error is a terminal, it is normally redirected to the
 same file descriptor as the (possibly-redirected) standard output.
 However, if standard output is closed, standard error terminal output is
 instead appended to the file ‘nohup.out’ or ‘$HOME/nohup.out’ as above.
 
    To capture the command’s output to a file other than ‘nohup.out’ you
 can redirect it.  For example, to capture the output of ‘make’:
 
      nohup make > make.log
 
    ‘nohup’ does not automatically put the command it runs in the
 background; you must do that explicitly, by ending the command line with
 an ‘&’.  Also, ‘nohup’ does not alter the niceness of COMMAND; use
 ‘nice’ for that, e.g., ‘nohup nice COMMAND’.
 
    COMMAND must not be a special built-in utility (⇒Special
 built-in utilities).
 
    The only options are ‘--help’ and ‘--version’.  ⇒Common
 options.  Options must precede operands.
 
    Exit status:
 
      125 if ‘nohup’ itself fails, and ‘POSIXLY_CORRECT’ is not set
      126 if COMMAND is found but cannot be invoked
      127 if COMMAND cannot be found
      the exit status of COMMAND otherwise
 
    If ‘POSIXLY_CORRECT’ is set, internal failures give status 127
 instead of 125.
 

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