[SOLVED] Sorting content of iwlist scan.

Chris_no · 07-08-2009, 05:43 AM

Hi.

I'm currently learning myself bash scripting.

I've run into a problem that I can see no easy solution to.

This is the script.
I've commented out the lines that are not working.

Code:

#!/bin/bash

flag=1
count=$(iwlist scan 2>/dev/null | grep Cell | wc -l)
(( count++ ))

while [ $flag -lt $count ]; do

cell=$(iwlist scan 2>/dev/null | grep "Cell 0$flag")
#essid=$(iwlist scan 2>/dev/null | grep ESSID ) #WHAT TO USE???


echo -n "$cell --- "
#echo "$essid"
echo ""

(( flag++ ))

done

exit 0

What I like to do is make the "ESSID" line appear behind the "Cell" line, but there are no uniqe way to identify this to grep.

Is there any other tool that can do this or just exract the collected info from the $essid variable?

Any advise to simplify my script even further is appeciated.

PS: I know that your favourite language probably beats shellscripting, but I'm not trying to learn that language right now.

Chris_no · 07-08-2009, 06:59 AM

Ah fixed the problem.

Code:

#!/bin/bash

flag=1
count=$(iwlist scan 2>/dev/null | grep Cell | wc -l)
iwlist scan 2>/dev/null | grep ESSID > buffer.cr

(( count++ ))

while [ $flag -lt $count ]; do

cell=$(iwlist scan 2>/dev/null | grep "Cell 0$flag")
essid=$(sed -n -e "${flag}p" ./buffer.cr)

echo -n "$cell"
echo "$essid"
echo ""

(( flag++ ))

done

exit 0

Tinkster · 07-08-2009, 10:13 PM

And a little off-topic note on the side (learning English as well as bash! ;}):

It's "teaching myself bash scripting" or "learning bash scripting".

Cheers,
Tink

Chris_no · 07-09-2009, 11:52 AM

That is nice to know.

In Norwegian to learn and to teach is almost the same word.
We say "lære"="learn" and "lære (bort)"="teach (away)".

To teach (away) to yourself is a new concept for me. :-)

Chris_no · 07-09-2009, 12:43 PM

I'll add the finished script commented and a bit fancier if anybody need it.

Code:

#!/bin/bash

#We define a loopcontrol flag and programpath
flag=1
path1="/home/chris/run/"
#We count the number of networks visible
count=$(iwlist scan 2>/dev/null | grep Cell | wc -l)

#We put the essid info in a temp-file before the loop
#since we only need it once.
iwlist scan 2>/dev/null | grep ESSID > buffer.cr

#Our loop checks the increasing value of flag agaisnt number of networks
until [ $flag -gt $count ]; do
	
	#We find the mac address of the networks one at a time and fixes the presentation
	cell=$(iwlist scan 2>/dev/null | grep "Cell 0$flag" | sed 's/Cell//')
	#We extract the network names from the temp-file one at a time
	essid=$(sed -n -e "$flag p" ./buffer.cr)

	echo $cell "---" $essid #Prints the netaddressinfo on screen

	(( flag++ )) #Adding to the flag so we know how far we have come in the loop

done | tee ${path1}nett.txt #We are done so we put the result in a file for later use

#In case root run this we don't want to be locked out
chown chris ${path1}nett.txt
#Deleting the temporary file buffer.cr
rm ./buffer.cr

exit 0

If you know any better way to do this let me know.