Shell脚本中的Ctrl C

Question

I've got a shell script with the following code;

#!/bin/bash
nfcapd -z -w -t30 -p 2055 -l /home/shane/Documents/nfdump

My problem is that when I execute the shell script, the command above executes over and over (it captures network traffic from a router), but I'd like for it to stop after 30 seconds. In the terminal I would just press Ctrl + c , is there a way of executing this command ( Ctrl + c ) after a certain time t?

Answer 1

Use timeout

timeout 30 nfcapd -z -w -t30 -p 2055 -l /home/shane/Documents/nfdump

More info here

Answer 2

Put this statement after #!/bin/bash

(sleep 30 ; kill -9 $$ )&

See if it works in your case.

Answer 3

You may also kill the last job:

#! /bin/bash
nfcapd -z -w -t30 -p 2055 -l /home/shane/Documents/nfdump &
sleep 30 ; kill %%
echo "nfcapd terminated"
exit 0