bash. while loop with xargs kill -9 -

i have list of ip addresses , have run command every single ip address.

i did code:

array=($(</tmp/ip-addresses.txt)) in "${array[@]}"; ./command start $i & done 

now, list of ip addresses refreshed every 2 minutes , need kill every command no longer new ip addresses. practically, command needs executed again every 2 minutes refreshed ip addresses , old ip needs killed.

how can that?

a simple workaround: (not tested)

sleep_delay=120 # 2 mins while true;      (          array=($(</tmp/ip-addresses.txt))         in "${array[@]}";         ./command start $i &         done         sleep $(( sleep_delay + 2 )) # 2 can number >0      ) & ppid=$!     sleep $sleep_delay     pkill -9 -p $ppid done 

note: have not optimized code, added wrapper around code.

edit: edited code satisfy requirement old processes should not killed, if ip still same.
note: haven't tested code myself, careful while using kill command. can test putting echo before kill statement. if works well, can use script...

declare -a pid_array  while true;      array=($(</tmp/ip-addresses.txt))      in `printf "%s\n" ${!pid_array[@]} | grep -v -f <(printf "%s\n" ${array[@]})`;         kill -9 ${pid_array[$i]} # please try use better signal kill, sigkill         unset pid_array[$i]     done      in "${array[@]}";         if [ -z "${pid_array[$i]}" ];              ./command start $i & pid_array[$i]=$!         fi     done      sleep 120 done