start application using shell script

Skiltron · 12-23-2008, 04:26 AM

Hey

I'm kind of new to shell scripts..
I want to start an application when the dhcp3-server sends out a lease

I got the line:

ip=sudo tail /var/log/syslog | grep "dhcpd: DHCPACK" | cut -d " " -f 9
echo $ip

output:
192.168.0.29
192.168.0.30

Now I'd like my app to start so no echo anymore
In the terminal you would start it as "appname 192.168.0.29"

Is that possible and can the app start as a new thread?
So you could run it twice at the same time?

Thanks a lot,

schneidz · 12-23-2008, 08:09 PM

not quite sure what you are trying to do. also [code] tags make it easier to read.

^i think you are missing backticks

Code:

ip=`sudo tail /var/log/syslog | grep "dhcpd: DHCPACK" | cut -d " " -f 9`

now if you want to run a program then add this line to your shell script:

Code:

appname 192.168.0.29 &

the & sends it to the background the script will go to the next line without waiting for it to finish.

this seems more programming appropriate.

Skiltron · 12-24-2008, 12:51 PM

Sorry for being so unclear

I'd like to make it continuous so I added the -f to tail.
every time there is a dhcpack in the syslog the application should start with the ip address as an parameter value.

In the terminal you could start the application this way:

Code:

appname ip

For instance:

Code:

app 192.168.0.29

Thanks for your help man:P