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Full Discussion: Trapping Background Process
Top Forums Shell Programming and Scripting Trapping Background Process Post 302959722 by Don Cragun on Thursday 5th of November 2015 01:06:50 PM
Old 11-05-2015
Quote:
Originally Posted by Showdown
I am calling one shell script from my wrapper shell script
The pseudo code for the same is

Code:
  nohup  sh script1.sh
  script.sh is  calling  script2.sh inside it  5 times followed by a  wait command 
  
  
  #1 /bin/bash
  nohup sh script2.sh 1 &
  nohup sh script2.sh 2 &
  nohup sh script2.sh 3 &
  nohup sh script2.sh 4 &
  nohup sh script2.sh 5 &
  wait.
  connect sql --> stmp success/fail status to error log table.

The sql statement at the bottom of the script should insert a success flag if all the background scriptts are successful.
If one or more background script fails then it should stamp the error message in the errorlog table with the error code and PID.

Can you guys focus some light on the above !!!
Many Thanks
Note that the line in red is just a comment. To have a line like that specify the shell to be used to run the script, you need #! instead of #1 and the #! must appear at the start of the line (with no leading spaces), and there shouldn't be any spaces between #! and the pathname of the shell you want to use.

For the rest of it, I'll let you form the sql, but the following will show you how to get save the PIDs and the exit status of each of the background jobs:
Code:
#!/bin/bash
nohup sh script2.sh 1 &
pid1=$!
nohup sh script2.sh 2 &
pid2=$!
nohup sh script2.sh 3 &
pid3=$!
nohup sh script2.sh 4 &
pid4=$!
nohup sh script2.sh 5 &
pid5=$!
wait $pid1
ec1=$?
echo "$pid1 exited with exit code $ec1"
wait $pid2
ec2=$?
echo "$pid2 exited with exit code $ec2"
wait $pid3
ec3=$?
echo "$pid3 exited with exit code $ec3"
wait $pid4
ec4=$?
echo "$pid4 exited with exit code $ec4"
wait $pid5
ec5=$?
echo "$pid5 exited with exit code $ec5"

 

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LEARN ABOUT CENTOS

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 /dev/null.  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.

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

AUTHOR

       Written by Jim Meyering.

COPYRIGHT

       Copyright (C) 2013 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

       The full documentation for nohup is maintained as a Texinfo manual.  If the info and nohup programs are properly installed  at  your  site,
       the command

	      info coreutils 'nohup invocation'

       should give you access to the complete manual.

GNU coreutils 8.22						     June 2014								  NOHUP(1)
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