run a command conditionally with netcat and grep

问题

I need netcat to listen on incomming HTTP requests, and depending on the request, I need to run a script.

So far I have this;

netcat -lk 12345 | grep "Keep-Alive"

So every time netcat recieves a package that contains a "keep-alive", I need to fire a script.

It needs to run in the crontab...

Thanks for your help!

回答1:

How about this?

    #!/bin/bash

    netcat -lk -p 12345 | while read line
    do
        match=$(echo $line | grep -c 'Keep-Alive')
        if [ $match -eq 1 ]; then
            echo "Here run whatever you want..."
        fi
    done

Replace the "echo" command with the script you want to execute.

回答2:

How about:

#!/bin/bash
netcat -lk -p 12345 | grep 'Keep-Alive' | while read unused; do
    echo "Here run whatever you want..."
done

Or

#!/bin/bash
netcat -lk -p 12345 | sed -n '/Keep-Alive/s/.*/found/p' | xargs -n 1 -I {} do_something
# replace do_something by your command.

来源：https://stackoverflow.com/questions/17990099/run-a-command-conditionally-with-netcat-and-grep