volume.sh

#!/bin/bash
# 2021-04-28 by Noah Coad
# simple bash script to turn the Mac OSX volume up, down, get value, or set
# vol     = get current volume level
# vol u   = volume up by 5%
# vol d   = volume down by 5%
# vol 25  = set volume level between 0-100

re='^[0-9]+$'
dir=
if [[ "$1" == "u" ]]; then   # volume up
	dir=+  
elif [[ "$1" == "d" ]]; then # volume down
	dir=-
elif [[ "$1" == "" ]]; then
	echo $(osascript -e 'output volume of (get volume settings)')
elif [[ $1 =~ $re ]]; then
	osascript -e "set volume output volume $1"
else
	echo Control OSX Volume Level: vol '[u/d/#]'
fi

# volume up or down
if ! [[ -z "$dir" ]]; then
	osascript -e "set volume output volume $(( ( $(osascript -e 'output volume of (get volume settings)') $dir 5 ) / 5  * 5))"
fi