volume.py

import alsaaudio
import sys

m = alsaaudio.Mixer()
vol = m.getvolume()

def getVolume():
	global vol
	return vol[0]

def increase(n):
	global vol
	if (vol[0] + n)>100:
		vol[0]= 100 - n
	m.setvolume(vol[0] + n)
	vol = m.getvolume()
	print "Volume increased to " + str(vol[0]) + " percent"

def decrease(n):
	global vol
	if (vol[0] - n)>100:
		vol[0]= 100 + n
	m.setvolume(vol[0] - n)
	vol = m.getvolume()
	print "Volume decreased to " + str(vol[0]) + " percent"

def setVolume(n):
	global vol
	m.setvolume(n)
	vol = m.getvolume()	
	print "Volume set to " + str(vol[0]) + " percent"

if len(sys.argv) == 1 or sys.argv[1] == "g":
	print "Current volume is " + str(getVolume()) + " percent"

if len(sys.argv)>=3:
	if sys.argv[1] == "i":
		try:
			i = int(sys.argv[2])
			increase(i)
		except ValueError:
			print "Please specify a number after saying increase volume by"

	elif sys.argv[1] == "d":
		try:
			d = int(sys.argv[2])
			decrease(d)
		except:
			print "Please specify a number after saying decrease volume by"

	elif sys.argv[1] == "s":
		try:
			s = int(sys.argv[2])
			setVolume(s)
		except:
			print "Please specify a number after saying set volume to"