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Full Discussion: Script to Proceed to the Next IP if the current IP hangs
Top Forums Shell Programming and Scripting Script to Proceed to the Next IP if the current IP hangs Post 303004748 by drysdalk on Sunday 8th of October 2017 03:43:38 AM
Old 10-08-2017
Hi,

Without knowing any actual details of what your script does or contains, it's hard to give you a definitively correct answer here. But in terms of a general principle, you could process each IP in a loop, run your script for each IP in the background, then wait a number of seconds before proceeding to the next one in the loop. That way at least you would be able to continue with each IP in the list.

So for example, something like this:

Code:
for ip in `cat ip-list.txt`
do
        ./script.sh "$ip" &
        sleep 300
done

Now I'm making a great deal of assumptions here, since you haven't given us any actual code of your own or any details about what precisely you're trying to do to each IP. But the above code fragment would iterate through every IP address in the file ip-list.txt and run the external script ./script.sh on it in the background. It would then pause for five minutes (300 seconds), and proceed regardless of the outcome with the next one in the list.

There are many potential problems with this approach, but this is about as generic a solution as I can suggest without anything detailed to actually go on. Hope this helps.
 

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LEARN ABOUT CENTOS

pidof

PIDOF(8)						Linux System Administrator's Manual						  PIDOF(8)

NAME

       pidof -- find the process ID of a running program.

SYNOPSIS

       pidof [-s] [-c] [-n] [-x] [-m] [-o omitpid[,omitpid..]]	[-o omitpid[,omitpid..]..]  program [program..]

DESCRIPTION

       Pidof  finds  the  process  id's (pids) of the named programs. It prints those id's on the standard output. This program is on some systems
       used in run-level change scripts, especially when the system has a System-V like rc structure. In that case these scripts  are  located	in
       /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should be used instead.

OPTIONS

       -s     Single shot - this instructs the program to only return one pid.

       -c     Only  return  process ids that are running with the same root directory.	This option is ignored for non-root users, as they will be
	      unable to check the current root directory of processes they do not own.

       -n     Avoid stat(2) system function call on all binaries which are located on network based file systems like NFS.  Instead of using  this
	      option the the variable PIDOF_NETFS may be set and exported.

       -x     Scripts too - this causes the program to also return process id's of shells running the named scripts.

       -o omitpid
	      Tells  pidof  to omit processes with that process id. The special pid %PPID can be used to name the parent process of the pidof pro-
	      gram, in other words the calling shell or shell script.

       -m     When used with -o, will also omit any processes that have the same argv[0] and argv[1] as any explicitly omitted process	ids.  This
	      can be used to avoid multiple shell scripts concurrently calling pidof returning each other's pids.

EXIT STATUS

       0      At least one program was found with the requested name.

       1      No program was found with the requested name.

NOTES

       pidof is actually the same program as killall5; the program behaves according to the name under which it is called.

       When  pidof  is invoked with a full pathname to the program it should find the pid of, it is reasonably safe. Otherwise it is possible that
       it returns pids of running programs that happen to have the same name as the program you're after but are  actually  other  programs.  Note
       that that the executable name of running processes is calculated with readlink(2), so symbolic links to executables will also match.

SEE ALSO

       shutdown(8), init(8), halt(8), reboot(8), killall5(8)

AUTHOR

       Miquel van Smoorenburg, miquels@cistron.nl

								    01 Sep 1998 							  PIDOF(8)
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