Debian bash script, checking gateway by ping script as cron job

Asked Dec 21 '20 at 22:37

Active Dec 21 '20 at 22:45

Viewed 95 times

Have next bash script /home/admin2/wlan0r.sh under root:

#!/bin/bash

while true; do
        if ping -c 1 -W 5 192.168.1.254; then
                sleep 15
        else
                echo "PING GW ERROR"
                ifdown wlan0
                sleep 2
                ifup wlan0
        fi
done

and sudo crontab -l job:

# ...
* * * * * /home/admin2/wlan0r.sh

and that doesn't work (script wont down and up wlan0 interface when wifi router reboots). But when i type directly from keyboard: sudo -i, then ifdown wlan0, then ifup wlan0 all works fine (successfully reconnected to WiFi AP)

What i missed up?

asked Dec 21 '20 at 22:37

Sergey Ivaniukovich

An additional issue here is that you're starting an infinite loop every minute, meaning that within a very short time a whole heap of these scripts will be competing to restart the AP. – l0b0 Dec 21 '20 at 22:41
did you chmod the script? – eyal Dec 21 '20 at 22:43
Yes, script have +777 rights – Sergey Ivaniukovich Dec 21 '20 at 22:44
2 l0b0is cron works like this? – Sergey Ivaniukovich Dec 21 '20 at 22:53
Besides the PATH problem, better use systemd timer if possible. Much more flexible. – Marco Dec 22 '20 at 09:03

Debian bash script, checking gateway by ping script as cron job

0 Answers0