How to get the signal quality value from the /proc/net/wireless file

boscop · 03-12-2012, 11:38 AM

Hi, I am writing a bash file where the signal level will trigger the handover, I want to get the signal level value or the value of the quality of the link from the /proc/net/wireless and i don't know how to do it as I need it to be able to do my project

Thanks for your help

xeleema · 03-12-2012, 02:57 PM

Greetingz!

Okay, this *kind* of sounds like a homework question, but I'll bite;

1) Make sure you can 'read' the file.

Code:

user@linux$ ls -l /proc/net/wireless
-r--r--r-- 1 root root 0 Mar 12 14:54 /proc/net/wireless

2) Since it's a /proc file, you're probably going to have to just 'cat' it and 'grep' for the output

Code:

user@linux$ cat /proc/net/wireless
Inter-| sta-|   Quality        |   Discarded packets               | Missed | WE
 face | tus | link level noise |  nwid  crypt   frag  retry   misc | beacon | 20

(I have no interfaces defined because I ripped-out my WiFi card).

Hint: If you already know the name of the interface, 'cat filename | awk '/iface/ {print $field#}'