Reading file (output from xrandr -q)

[arvigeus]

#!/bin/bash
touch xrandr
xrandr -q > xrandr #place xrandr in file, works 
for (( VAR=0 ;  ; VAR++ )) 
do
	TMP=$(cat xrandr | awk 'NR==$VAR { printf $2 }') #null?
	TMP1=$(cat xrandr | awk 'NR==$VAR { printf $1 }')  #null?
	if [ "$TMP"=="" ]; then break #EOF
		elif [ "$TMP"~="connected" ]; then #new display
			rm $TMP1 #remove previous file
			touch $TMP1
			TMP2=$TMP1 #set path for storing resolutions
		elif [ "$TMP2"!="" ]; then echo "$TMP1 " >> $TMP2
	fi
done

I'm trying to make several files: each named after the display and containing resolutions. But for some reason I get null when trying to read lines. Also, I'm noob.

[Cabhan]

The problem has to do with your awk scripts.

Although you have defined a variable called VAR, this variable is a Bash variable, not an awk variable. Therefore, in your awk script, it looks for the varaible VAR, sees that it doesn't exist, and treats $VAR as $0, which isn't what you want.

You can do something like:

TMP=$(cat xrandr | awk -v "VAR=$VAR" 'NR==VAR { printf $2 }')

This way, you have defined the awk VAR variable to be the same as the Bash $VAR variable.

[arvigeus]

CONNECTED=$(cat xrandr | awk -v "VAR=$VAR" 'NR==VAR { printf $2 }')

cat: No such file or directory

What I'm missing? (tested with single quotes as well)