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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

Try this:

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

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...

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...