Change Windows sound volume via the command line

Is it possible to change the volume in Windows XP via the command line?

Answer

NirCmd is an application that does that and more.

Example of use:

• Increase the system volume by 2000 units (out of 65535)
  nircmd.exe changesysvolume 2000


• Decrease the system volume by 5000 units (out of 65535)
  nircmd.exe changesysvolume -5000


• Set the volume to the highest value
  nircmd.exe setsysvolume 65535


• Mute
  nircmd.exe mutesysvolume 1


• Unmute
  nircmd.exe mutesysvolume 0