xrandr-max-monitor-res.sh

#!/bin/bash
dt=$(mktemp);
xrandr &> "$dt";

scr_size(){
        read width height <<<$(IFS="x";echo $1);
        size=$(($width * $height));
        echo $size;
}

scr="default";
found="0";
lsize=0;
xline="";

set_max(){
        xline=$1;
}

while read line; do
        if [ $found = "0" ]; then
                if [[ $line =~ "$scr connected" ]]; then
                        found="1";
                fi;

                continue;
        fi;

        if [ "$found" = "1" ]; then
                if [[ "$line" =~ "connected" ]]; then
                        break;
                fi;
                scrsize=$(scr_size $line);
                if [ $scrsize -gt $lsize ]; then
                        lsize=$scrsize;
                        set_max $line;
                fi;
        fi;
done < $dt;

echo "Max: $xline";