Script to enable multiple monitors using Xrandr

multidisplay.sh

#!/bin/sh
# Author: siddhesh.in
# Here’s a script I’ve written to do this with any external display (monitor, projector, etc.).
# Execute it after connecting the display to your box:

typeset -a resx
typeset -a resy
typeset -a screen
typeset -i name=1
typeset -i count=0

tmpfile=$(mktemp)
cmd="xrandr --fb "

xrandr | grep -A 1 " connected " | grep -v "^--$" | awk '{print $1}' > $tmpfile
count=0

for line in $(cat $tmpfile); do
       if [ $name -eq 1 ]; then
               screen[$count]=$line
               name=0
       else
               line=$(echo $line|sed 's/[Xx]/ /g')
               resx[$count]=$(echo $line | awk '{print $1}')
               resy[$count]=$(echo $line | awk '{print $2}')
               count=$((count+1))
               name=1
       fi
done

total_width=0
prev_scr=
max_height=0
for i in $(seq 0 $((count-1))); do
       if [ $max_height -lt ${resy[$i]} ]; then
               max_height=${resy[$i]}
       fi

       cmd_ext="$cmd_ext --output ${screen[$i]} --mode ${resx[$i]}x${resy[$i]}"
       if [ -n "$prev_scr" ]; then
               cmd_ext="$cmd_ext --right-of $prev_scr"
       fi
       prev_scr=${screen[$i]}

       total_width=$((total_width+${resx[$i]}))
done

cmd="xrandr --fb ${total_width}x${max_height} $cmd_ext"

echo "Running command: $cmd"
eval $cmd

rm -f tmpfile

Nice script. There is a typo. > in line 15 should be >.