Dump audio to wav format using mplayer

mplayer input.mp4 -vc null -vo null -ao pcm:fast:waveheader:file=audio.wav

Play raw audio using mplayer

To play raw pcm file using mplayer use below command, which plays a pcm file "audio.pcm" whose sample rate is 192000 KHz, 32 bit, stereo

mplayer -rawaudio rate=192000:channels=2:samplesize=4 -format s32le -demuxer rawaudio audio.pcm

How to use bash function defined in .bashrc file into bash script

First define function in .bashrc and then export it

d2h(){
  echo "obase=16; $@"|bc
}
export -f d2h

Above function converts decimal to hex and then export it, so that it can be used from other bash scripts

Rescue and Recovery software

Trinity rescue kit is good software for recovery. It can reset password also. This can be run directly from usb drive using http://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/
http://trinityhome.org/