shell script with "netcat > file" at boottime

trajjm · 10-09-2005, 11:58 AM

Hi Folks,

i try to start this script at boottime:

Code:

nohup nice netcat 192.168.1.100 2000 > cardreaderfile &

to dump the traffic from a rfid-reader in a file.
When i execute this script by hand in a terminal, it works perfect and runs i the background!
but inserting the script in a initfile it does not start.

In an different project i was using a pipe after netcat :

Code:

nohup nice netcat 192.168.1.100 2000 | somescript &

and it works also at boottime!!

So i thing the probleme is somewhere with the fileoperator ">"

Has someone an idea how to get this working?
many thanks
joerg

cardy · 10-10-2005, 05:52 AM

Which file are you using to start this script ? Obviously you will need to ensure it is run after the network interfaces have been started.

Also have you checked the file nohup.out (which is created by the nohup command) to see what output was created (if any).

trajjm · 10-10-2005, 06:42 AM

i have created a startscript in the init.d directory (from the suse-skeleton).
this startscript runs only in init level 3 after the network is up and calls the following script:

Code:

#! /bin/bash
nohup nice netcat 10.40.123.1 2000 | /keycard/key01 &
nohup nice netcat 10.40.123.2 2000 | /keycard/key02 &
nohup nice netcat 10.40.123.3 2000 | /keycard/key03 &
nohup nice netcat 10.40.123.4 2000 | /keycard/key04 &

nohup nice netcat 10.40.123.5 2000 > key05.txt &

all the netcat commands which pipes ther output to another script , are running fine in the background..
the netcat command which should redirect his output in the file > key05.txt is not starting :-( (there is also no nohup.out file generated)
if i start this script in a terminal, everything is working fine !
hmm?

cardy · 10-10-2005, 06:54 AM

Sorry I should have noticed earlier.

Try taking off the nohup on the command which is using the redirect (>). The reason for this is that nohup redirects all output to the file nohup.out thus your trying to redirect output which has already been redirected.