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You are expecting that the environment for a cron job is the same as when you log in. This is not the case and is a very common mistake, probably including everyone who has ever tried it.

The...

Try giving full path to service. Like :

/sbin/service $SERVICENAME status > /dev/null

When Corona688 says that the 'reboot' command is not interactive I think he means that it doesn't ask for confirmation. If you are root then that command (on most Unix flavors) will reboot the...

Try this:

tcpdump -i eth1 icmp[0] =8 >output.txt &
sleep 60; kill $!

reboot is not an interactive command.

printf "Are you sure you want to reboot [y/n]"
read RESPONSE
if [ "$RESPONSE" = "Y" ]
then
/sbin/reboot
else
echo "response not Y"
fi

You can try redirecting /dev/null into it. telnet hostname port </dev/null

It should connect, try and read input from /dev/null, get EOF, and quit.

telnet may not really be the tool for the...