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vbtricks

Member

From: Germany

Registered: 2008-03-20

Posts: 37

Website

[solved] Running a command in background (bash script)

Salut,

as netcfg2 does not work with my wireless connection, I have to set up the connection manually. For not having to type in the commands every time, I created a bash script.

#!/bin/bash
iwconfig wlan0 mode managed essid mynetwork channel 6
ifconfig wlan0 up
wpa_supplicant -D wext -i wlan0 -c /etc/wpa_supplicant.conf -dddd &
dhcpd wlan0

This works fine till the wpa_supplicant line. wpa_supplicant is not started in the background (as I thought, the ampersand at the end of the line would.

So how can I get wpa_supplicant run in the background?

Thanks in advance,

Stefan

Last edited by vbtricks (2008-05-11 09:13:36)

Ramses de Norre

Member

From: Leuven - Belgium

Registered: 2007-03-27

Posts: 1,289

Re: [solved] Running a command in background (bash script)

How do you know it isn't? What exactly does happen?

bender02

Member

From: UK

Registered: 2007-02-04

Posts: 1,328

Re: [solved] Running a command in background (bash script)

On thing is that even if it starts, it does take it a couple of seconds to connect, so it's probably not very good to run dhcpcd right after wpa_supplicant. Another thing is that you probably have a typo up there, shouldn't it be 'dhcpcd' instead of 'dhcpd'?

vbtricks

Member

From: Germany

Registered: 2008-03-20

Posts: 37

Website

Re: [solved] Running a command in background (bash script)

How do you know it isn't? What exactly does happen?

The script does not return to the user-prompt. Is an ampersand at the end of the line the correct solution, or are you unsure yourself?

On thing is that even if it starts, it does take it a couple of seconds to connect, so it's probably not very good to run dhcpcd right after wpa_supplicant. Another thing is that you probably have a typo up there, shouldn't it be 'dhcpcd' instead of 'dhcpd'?

Well, as the wpa_supplication command is not really run in the background the script did never execute the dhcpcd command. After having solved the above, correcting the spell-mistake will be a smaller problem. Even calling the dhcpcd command myself would be no unworkable way, the open root-shell (as I have to use another as the one calling the script is blocked) is a far greater problem...

nDray

Member

From: Portugal

Registered: 2007-01-21

Posts: 143

Website

Re: [solved] Running a command in background (bash script)

wpa_supplicant goes to the background by using the switch "-B".
man wpa_supplicant

vbtricks

Member

From: Germany

Registered: 2008-03-20

Posts: 37

Website

Re: [solved] Running a command in background (bash script)

Salut,

"-B" works fine.

Thanks,

Stefan