bash alias: set Volume

bash-volume-alias.sh

# ------------------------------- LINUX ------------------------------- 
# for Linux (requires alsa-utils which is installed on most major distributions)
# usage:
# set volume to 50%
# $ vol 50%
# increase volume by 10%
# $ vol 10%+
# decrease volume by 25%
# $ vol 25%-

alias volume='amixer -D pulse sset Master'
alias vol='volume'

# ------------------------------- OS X ------------------------------- 
# for OS X (no requirements)
# usage: set the volume as a number between 0-7
# $ vol 5

function vol {
	osascript -e "set Volume ${1}"
}

# volume ramper for OS X
function volr {
	# as you would expect, you pass the endvolume to this script
	endvol=$1;
	
	# getting the current volume (0-100) and converting it to (0-7)
	startvol=$(osascript -e 'set ovol to output volume of (get volume settings)');
	startvol=$(($startvol * 7 / 100 + 1))
	
	# the increment to use
	increment=0.1

	# make the increment negative if the volume should ramp down
	if [ $endvol -lt $startvol ]
	then
		increment=$((-$increment))
	fi
	
	# echo the start volume
	echo -n $startvol;

	for i in $(seq $startvol $increment $endvol)
	do
		# clear the line and output the new volume
		echo -ne "\r\r\r $i";
		vol $i;
	done
}