[英]bash. while loop with xargs kill -9
I have a list of IP addresses and I have to run a command for every single IP address. 我有一个IP地址列表,我必须为每个IP地址运行一个命令。
I did it with this code: 我用这段代码做了:
array=($(</tmp/ip-addresses.txt))
for i in "${array[@]}"; do
./command start $i &
done
Now, the list of IP addresses is constantly refreshed every 2 minutes and I need to kill every command that is no longer with the new IP addresses. 现在,IP地址列表每2分钟不断刷新一次,我需要删除不再使用新IP地址的每个命令。 Practically, the command needs to be executed again every 2 minutes with the refreshed IP addresses and all the another old IP needs to be killed. 实际上,需要使用刷新的IP地址每2分钟再次执行该命令,并且需要杀死所有其他旧IP。
How can I do that? 我怎样才能做到这一点?
A simple workaround: (Not tested) 一个简单的解决方法:(未测试)
sleep_delay=120 # 2 mins
while true; do
(
array=($(</tmp/ip-addresses.txt))
for i in "${array[@]}"; do
./command start $i &
done
sleep $(( sleep_delay + 2 )) # 2 can be any number >0
) & PPID=$!
sleep $sleep_delay
pkill -9 -p $PPID
done
Note: I have not optimized your code, just added a wrapper around your code. 注意:我没有优化您的代码,只是在代码周围添加了一个包装器。
EDIT: Edited code to satisfy requirement that the old processes should not be killed, if the IP is still same. 编辑:如果IP仍然相同,编辑代码以满足不应该杀死旧进程的要求。
NOTE: I haven't tested the code myself, so be careful while using the kill command. 注意:我自己没有测试过代码,因此在使用kill命令时要小心。 You can test by putting echo
before the kill
statement. 您可以通过在kill
语句之前放置echo
来进行测试。 If it works well, you can use the script... 如果它运作良好,您可以使用脚本...
declare -A pid_array
while true; do
array=($(</tmp/ip-addresses.txt))
for i in `printf "%s\n" ${!pid_array[@]} | grep -v -f <(printf "%s\n" ${array[@]})`; do
kill -9 ${pid_array[$i]} # please try to use better signal to kill, than SIGKILL
unset pid_array[$i]
done
for i in "${array[@]}"; do
if [ -z "${pid_array[$i]}" ]; then
./command start $i & pid_array[$i]=$!
fi
done
sleep 120
done
Your script would be changed like: 您的脚本将更改为:
#!/bin/bash
GAP=120
while :
do
#Do your stuff here
sleep $GAP
done
exit 0
After two minutes it would read from refreshed file 两分钟后,它将从刷新的文件中读取
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