Script to automatically check ports in shell?

Shell Programming and Scripting
1

Good day,

I'm new to linux environment...Is there any scripts available for me to check ports (lets say port 80 and 21) through shell with just a single commandline?

Any response is very much appreciated..
thanks

2

check for what?

3

Are you trying to say that you wanted to check for open ports on a certain machine? If that's the case you can use the nmap utility. Check it's manual.

Hope this helps.

4

@DukeNuke2
check if the port connection of a particular ip/domain is okay or not...

@yongitz
i'll take alook on that...

tanx 4 ur response...

5

Another easy way, to check port 80 for example:

if telnet hostname 80 < /dev/null 2>&1 | grep -q Connected
then
    echo its fine
else
    echo port 80 is down!
fi