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#!/bin/bash
# xrandr.sh 
#If no argument is specified, ask for it and exit
if [[ -z "$@" ]];  
then
echo "An argument is needed to run this script";  
exit
else
arg="$@"  
#Basic check to make sure argument number is valid. If not, display error and exit
if [[ $(($(echo $arg | grep -o "\s" | wc --chars) / 2 )) -ne 2 ]];  
then
echo "Invalid Parameters. You need to specify parameters in the format "width height refreshRate""  
echo "For example setResolution "2560 1440 60""  
exit
fi

#Save stuff in variables and then use xrandr with those variables
modename=$(echo $arg | sed 's/\s/_/g')  
display=$(xrandr | grep -Po '.+(?=\sconnected)')  
if [[ "$(xrandr|grep $modename)" = "" ]];  
then
xrandr --newmode $modename $(gtf $(echo $arg) | grep -oP '(?<="\s\s).+') &&  
xrandr --addmode $display $modename 
fi
xrandr --output $display --mode $modename

#If no error occurred, display success message
if [[ $? -eq 0 ]];
then
echo "Display changed successfully to $arg"  
fi
fi

<<COMMENT
#Manual steps with explanation ahead by @debloper
# First we need to get the modeline string for xrandr
# Luckily, the tool "gtf" will help you calculate it. 
# All you have to do is to pass the resolution & the-
# refresh-rate as the command parameters:
gtf 1920 1080 60

# In this case, the horizontal resolution is 1920px the
# vertical resolution is 1080px & refresh-rate is 60Hz.
# IMPORTANT: BE SURE THE MONITOR SUPPORTS THE RESOLUTION

# Typically, it outputs a line starting with "Modeline" 
# e.g. "1920x1080_60.00" 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -HSync +Vsync 
# Copy this entire string (except for the starting "Modeline") 

# Now, use "xrandr" to make the system recognize a new 
# display mode. Pass the copied string as the parameter
# to the --newmode option:
xrandr --newmode "1920x1080_60.00" 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -HSync +Vsync  

# Well, the string within the quotes is the nick/alias
# of the display mode - you can as well pass something
# as "MyAwesomeHDResolution". But, careful! :-| 

# Then all you have to do is to add the new mode to the
# display you want to apply, like this:
xrandr --addmode VGA1 "1920x1080_60.00"  

# VGA1 is the display name, it might differ for you.
# Run "xrandr" without any parameters to be sure. 
# The last parameter is the mode-alias/name which
# you've set in the previous command (--newmode) 

# It should add the new mode to the display & apply it.
# Usually unlikely, but if it doesn't apply automatically 
# then force it with this command:
xrandr --output VGA1 --mode "1920x1080_60.00"  

# That's it... Enjoy the new awesome high-res display! 
COMMENT