Volume Control script for Raspberry Pi

Here is a small script to control audio volume. Feel free to modify the script as per need. Make sure pulseaudio is is up and running.

Filename: volchg.sh

Usage: 
volchg.sh [+/-] [x]

volchg.sh --increase volume by 5%
volchg.sh + --increase volume by 5%
volchg.sh + 10 --increase volume by 10%
volchg.sh - --decrease volume by 5%
volchg.sh - 10 --decrease volume by 10%

Script

#!/bin/sh
#############################
### Volume Up/Down Script ###
#############################

# Specify increase or decrease
MODE=$1

# Percentage Change
VAL=$2

#Set defaut change to 5%
if [ -z "$2" ]; then
  VAL=5
fi

#Get MAX Value
MAX_VOL=`amixer cget numid=3 | grep "max=" |  cut -d, -f5 | cut -d= -f 2`

#Get current val
CURRENT_VOL=`amixer cget numid=3 | grep ":" | cut -d, -f2`

#UPDATE VOL

if [ "$MODE" = "+" ]; then
  MUL=1
else
  MUL=-1
fi

NEW_VOL=$(( ($CURRENT_VOL + ($MUL * (( $VAL * $MAX_VOL) / 100 ))) ))
PER_VOL=$(( ($NEW_VOL * 100) / $MAX_VOL ))

amixer cset numid=3 $NEW_VOL > /dev/null
echo "Volume Level: $PER_VOL%"

Have fun !!!