Timer for a shell script command

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Good afternoon, everyone,

I want to write a script with a command that captures all wireless network flow around my company and store it in a text file. Currently I do so:

airmon-ng start 'nome da placa de rede wifi'
airodump-ng -a wlan0mon 2>&1 | tee captura.txt

It happens that to interrupt the capture it is necessary to press CTRL+C and I have to capture for 10, 15 or 20 minutes, so that the file does not get gigantic!

Does anyone have any suggestions for this process to stop without pressing CTRL+C?

bash shell-script
  • 1

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  • 1

    I thought his question was valid, since it’s about programming in bash and shell script.

2 answers

1


You can use Kill -INT, which does the job of Ctrl+C

# Roda o script de captura em background
./x.sh &
# Aguarda 1 minuto (seconds)
sleep 60
# Kill 
killall -INT airodump-ng

Optionally, you can use killall -9 airodump-ng

Tested with bash 4.3

0

You can use the command timeout which is just what you need, running a program and shutting it down after a certain time.

examples:

timeout 15 ping 8.8.8.8

In your case I think it would look something like

timeout 20m ./seu_script

The nice thing about this command is that you can select what kind of Signal vc you want the program to receive, a SIG KILL or SIG TERM friendlier,

  • His option, at first seemed to me the best, but to maintain the automatic process, the colleague @Incrivel Monstro Verde Cabelud was more performative! The timeout, while actually interrupting the process, requires some action after execution.

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