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Red Hat Enterprise Linux Server release 5.4 (Tikanga) 2.6.18-164.el5
I am trying to use the watch command combined with the netstat to see the 2 programs using certain ports.
However, with the command I using below doesn't work for both words:
watch -n1 "netstat -upnlt | grep gateway\|MultiMedia"
Is this the correct way to grep for both program names.
If I use one its ok, but both together doesn't work.
341
Use "extended grep" and the OR operator ( | ). Yes, you're right.
Using the Netstat Command Typically, Netstat displays all the ports in use by all processes, however, by adding the grep command, you can limit those results to only a specific designated port.
The network statistics ( netstat ) command is a networking tool used for troubleshooting and configuration, that can also serve as a monitoring tool for connections over the network. Both incoming and outgoing connections, routing tables, port listening, and usage statistics are common uses for this command.
The watch command is a built-in Linux utility used for running user-defined commands at regular intervals. It temporarily clears all the terminal content and displays the output of the attached command, along with the current system date and time.
For the grep you need:
"grep gateway\|MultiMedia"
So perhaps try:
watch -n1 'netstat -upnlt | grep "gateway\|MultiMedia"'
There's also the new way of doing things... grep -E is nice and portable (Or egrep, which is simply quick for grep -E on linux&bsd) so you don't have to escape the quote. From the man pages:
-E Interpret pattern as an extended regular expression (i.e. force
grep to behave as egrep).
So...
watch "netstat -upnlt | grep -E 'gateway|multimedia'"
or
watch "netstat -upnlt | egrep 'gateway|multimedia'"
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