Script to Proceed to the Next IP if the current IP hangs Post: 303004748

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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

10-08-2017

Registered User

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.

drysdalk

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LEARN ABOUT OSX

sleep

SLEEP(1)						    BSD General Commands Manual 						  SLEEP(1)

NAME

     sleep -- suspend execution for an interval of time

SYNOPSIS

     sleep seconds

DESCRIPTION

     The sleep command suspends execution for a minimum of seconds.

     If the sleep command receives a signal, it takes the standard action.

IMPLEMENTATION NOTES

     The SIGALRM signal is not handled specially by this implementation.

     The sleep command will accept and honor a non-integer number of specified seconds (with a '.' character as a decimal point).  This is a non-
     portable extension, and its use will nearly guarantee that a shell script will not execute properly on another system.

EXIT STATUS

     The sleep utility exits 0 on success, and >0 if an error occurs.

EXAMPLES

     To schedule the execution of a command for x number seconds later (with csh(1)):

	   (sleep 1800; sh command_file >& errors)&

     This incantation would wait a half hour before running the script command_file.  (See the at(1) utility.)

     To reiteratively run a command (with the csh(1)):

	   while (1)
		   if (! -r zzz.rawdata) then
			   sleep 300
		   else
			   foreach i (`ls *.rawdata`)
				   sleep 70
				   awk -f collapse_data $i >> results
			   end
			   break
		   endif
	   end

     The scenario for a script such as this might be: a program currently running is taking longer than expected to process a series of files, and
     it would be nice to have another program start processing the files created by the first program as soon as it is finished (when zzz.rawdata
     is created).  The script checks every five minutes for the file zzz.rawdata, when the file is found, then another portion processing is done
     courteously by sleeping for 70 seconds in between each awk job.

SEE ALSO

     nanosleep(2), sleep(3)

STANDARDS

     The sleep command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

HISTORY

     A sleep command appeared in Version 4 AT&T UNIX.

BSD
								  April 18, 1994							       BSD

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