a simple netcat script

[gothbox]

i need some help to put toghether a simple script to check if port 80 is open (netcat?)
# nc -z -v localhost 80
localhost [127.0.0.1] 80 (http) open

and if not , to start a script ...
something to set as a cron job maybe ?
im very new to programming , but this shouldnt be to hard ?

thanks alot

[Naib]

if lsof -i :80 >/dev/null; then echo "port 80 in use"; fi

[gothbox]

that didnt tell me to much to be honest , what does it do ?
i have a ssh session with tunnels running on my school computer , back home , and i need it to be restarted if either my home pc or school pc goes down..
i have no control from home , and would like the script to be restarted if my home computer goes down f,ex ..
its started each time the school pc boots

[Naib]

it checks if port-80 is open (needs to be run by root since it is a priv port) and if it is prints that str to the screen

[gothbox]

hahahahahahahaha!


i love you !!!

this is just what i want !


best wishes

[Naib]

[Ant P.]

This one's longer but it'll work without root:

Code: Select all

if netstat -tuna | grep ':80 .*LISTEN' > /dev/null; then
    # local port 80 is open
else
    # isn't
fi

[gothbox]

ill have a look at it thanks alot