RegExp help needed

[bluecherry]

Hi all,

I'm looking for ways to perform basic string parsing from the terminal.

To make my question more clear, i've included an example:

From the following text I would like to get:
* count GPUs >0 (line 1)
* count display devices (line 2)
* for each display device: name, sync (min/max horiz/vert), pref width/height, pref vertrefresh

I'm looking at grep and updating my RegExp knowledge but it has been years since I used it and I haven't used it in such advanced ways.

nvidia-xconfig --query-gpu-info

Number of GPUs: 1

GPU #0:
Name : GeForce4 Ti 4200
PCI BusID : PCI:1:0:0

Number of Display Devices: 2

Display Device 0 (CRT-0):
EDID Name : Brilliant Technology Bigtide-CM1770MK-0000007595
Minimum HorizSync : 26.237 kHz
Maximum HorizSync : 68.677 kHz
Minimum VertRefresh : 60 Hz
Maximum VertRefresh : 85 Hz
Maximum PixelClock : 108.000 MHz
Maximum Width : 1280 pixels
Maximum Height : 1024 pixels
Preferred Width : 1024 pixels
Preferred Height : 768 pixels
Preferred VertRefresh : 85 Hz
Physical Width : 320 mm
Physical Height : 240 mm

Display Device 1 (CRT-1):
EDID Name : CAL L15CX
Minimum HorizSync : 30.000 kHz
Maximum HorizSync : 60.000 kHz
Minimum VertRefresh : 56 Hz
Maximum VertRefresh : 75 Hz
Maximum PixelClock : 80.000 MHz
Maximum Width : 1024 pixels
Maximum Height : 768 pixels
Preferred Width : 1024 pixels
Preferred Height : 768 pixels
Preferred VertRefresh : 75 Hz
Physical Width : 300 mm
Physical Height : 230 mm



Thx!

[GarlicFish]

grep 'Number of GPUs' regexp.txt | cut -d' ' -f4

grep 'Number of Display Devices' regexp.txt | cut -d' ' -f7

Gets you the first two items

[bluecherry]

Thanks!

I didn't even know of the existence of cut.

I'm gonna play with it right away!

[GarlicFish]

Not sure about the next bit :-?

I'd probably look at python or perl or similar to read the text line by line and associate the values with their correct display.

Can't help though as I haven't got round to learning either yet. I'm still stuck in VB land ;)

[jordilin]

take a look at the command
awk
and
sed
Awk is extremely powerful to get chunks of text out of lines.

[GarlicFish]

Ah Ha :)

Just found this little beauty

#!/bin/bash
# START OF SCRIPT
exec < regexp.txt
while read line
do
echo $line
done
#END OF SCRIPT

[GarlicFish]

#!/bin/bash
# START OF SCRIPT
exec < regexp.txt
while read line
do
strParameter=$(echo $line | cut -d: -f1)
strValue=$(echo $line | cut -d: -f2)
echo Parameter = $strParameter
echo Value = $strValue
done

#END OF SCRIPT

I guess the next step would be to use grep, awk or sed to check each parameter to see if it is what you are after and if so store the value in a variable until you need to use it.

What do you want to do with the values once you have them?

[ifokkema]

Maybe this is of any use to you:


for i in 0 1;
do
echo "Display ${i} returns:";
nvidia-xconfig --query-gpu-info | grep -A 13 "Display Device ${i}" | grep -E "HorizSync|VertRefresh|Preferred";
done


It's simple (without sed or awk), but it might just do what you need.

[mikeym]

Here is a start for using sed and awk.


NOCPUS=`nvidia-xconfig --query-gpu-info | sed -n -e '1p' | awk 'BEGIN { FS=":" } { print $2 }'`
NODISPLAYS=`nvidia-xconfig --query-gpu-info | sed -n -e '7p' | awk 'BEGIN { FS=":" } { print $2 }'`

echo "CPU's: $NOCPUS"
echo "Displays: $NODISPLAYS"

COUNT=0
while [ $COUNT -lt $NODISPLAYS ]; do
NAME=`nvidia-xconfig --query-gpu-info | sed -n -e "/Display Device $COUNT/,/Physical Height/p" | awk 'BEGIN { FS=":" } /EDID Name/ { print $2 }'`
echo "Name display $COUNT: $NAME"
COUNT=$((COUNT+1))
done



Hope this helps.

I'm not sure about calling the same procedure 3+ times but I found when I put it in a variable it list the new lines?? Maybe you could put it in a temporary file and 'cat' it?

[bluecherry]

Thx all!

I'll try all your sugestions asap.

I would like to use these values as a part of an nvidia driver installer -> no manual editing anymore, just input in dialogs (zenity).

If I get this to work it will save me some trips to my friends (friends) to get their nvidia cards to work on a fresh install :-).

thx!!

[Eric_T]

Not sure if it's what you're after, but here's how you can put the numbers into variables using awk:

nvidia-xconfig --query-gpu-info > nvid.txt
gpus=`awk '/Number of GPUs/{print $4}' nvid.txt`
disps=`awk '/Number of Display Devices/{print $5}' nvid.txt`

The text between the slashes is the search string. The curly brackets contain the action, print $4 indicates that we want to print column 4 of the matched line(i.e. the number).

EDIT: I see that mikeym is two steps ahead of me...](*,)

[hasimir44]

can't leave out perl :)


#!/usr/bin/perl
while (<>) {
if (/GPU\s\#(\d+)/) {
print "GPU: $1\n";
} elsif (/Display Device\s(\d+)/) {
print "Display Device: $1\n";
$disp_devs++;
} elsif (/EDID Name\s+\:(.*)$/) {
print "Name: $1\n";
} elsif (/Sync/) {
print "$_";
} elsif (/Preferred/) {
print "$_";
}
}
print "Total Display Devices: $disp_devs\n";


I named the above perl script "help.pl" and your text as "help.txt" ..
Here's the output:


ubuntu@ubuntu:~$ ./help.pl help.txt
GPU: 0
Display Device: 0
Name: Brilliant Technology Bigtide-CM1770MK-0000007595
Minimum HorizSync : 26.237 kHz
Maximum HorizSync : 68.677 kHz
Preferred Width : 1024 pixels
Preferred Height : 768 pixels
Preferred VertRefresh : 85 Hz
Display Device: 1
Name: CAL L15CX
Minimum HorizSync : 30.000 kHz
Maximum HorizSync : 60.000 kHz
Preferred Width : 1024 pixels
Preferred Height : 768 pixels
Preferred VertRefresh : 75 Hz
Total Display Devices: 2



*Note: you asked for a VerticalSync, but there wasn't any in your example text..

[bluecherry]

Hehe, you're right vert sync was not in the list, I meant vert refresh.

Thx for the perl example, I was hoping to do it all in bash-script but I'm already considering perl and other language because of the complexity of the prog.

Thx!