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Full Discussion: Process id of the exe started with nohup
Top Forums Shell Programming and Scripting Process id of the exe started with nohup Post 302311213 by parvathi_rd on Tuesday 28th of April 2009 07:18:52 AM
Old 04-28-2009
Process id of the exe started with nohup
Hi,

I have a strange problem.
In my shell script, i am startting another program (a c++ exe) with nohup .
I am getting the process id of this started process with using $!
I am writing this process id into another file so that i can keep checking for this process ids to check whether the process is completed.
Additionally, the c++ exe also writes its process id into the log file.

When i check the process ids that i am capturing from the shell script and the process id from the log file of the exe, both are not matching.
Process id from the shell script is the parent process id not the child's process id.

Could someone please tell me what is wrong wiht my approach and how to get the process id of the child process accuraetly in my script.

below is the piece of shell script that i m using:

### Shell Script ########

nohup BDE arg1 arg2 arg3 &
proc_id=`echo $!`
echo $proc_id >> proc_id_file

###### code in c++ to get process id ####

process_id = getpid();
 

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LEARN ABOUT V7

nohup

NOHUP(1)                                                           User Commands                                                          NOHUP(1)

NAME

       nohup - run a command immune to hangups, with output to a non-tty

SYNOPSIS

       nohup COMMAND [ARG]...
       nohup OPTION

DESCRIPTION

       Run COMMAND, ignoring hangup signals.

       --help display this help and exit

       --version
              output version information and exit

       If  standard  input  is a terminal, redirect it from an unreadable file.  If standard output is a terminal, append output to 'nohup.out' if
       possible, '$HOME/nohup.out' otherwise.  If standard error is a terminal, redirect it to standard output.   To  save  output  to  FILE,  use
       'nohup COMMAND > FILE'.

       NOTE: your shell may have its own version of nohup, which usually supersedes the version described here.  Please refer to your shell's doc-
       umentation for details about the options it supports.

AUTHOR

       Written by Jim Meyering.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report nohup translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/nohup>
       or available locally via: info '(coreutils) nohup invocation'

GNU coreutils 8.28                                                 January 2018                                                           NOHUP(1)
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