pwgen

#!/bin/bash 
#via: http://thdonline.wordpress.com/2009/03/14/shell-script-to-generate-random-password/
#with a slight modification for my preferences

MAXSIZE=$1

if [ "$MAXSIZE" != "" -a "$MAXSIZE" == "${MAXSIZE//[^0-9]/}" ]
then
#I don't like the extra output
	MAXSIZE=$MAXSIZE
else
	MAXSIZE=16
fi

CHAR_ARRAY=( 
q w e r t y u i o p a s d f g h j k l z x c v b n m Q W E R T Y U I O P A S D 
F G H J K L Z X C V B N M 1 2 3 4 5 6 7 8 9 0 ! @ # $ % ^ & * ( ) 
)

MODNUM=${#CHAR_ARRAY[*]} 

PWD_LEN=0

while [ $PWD_LEN -lt $MAXSIZE ] 
do 
  X=$(($RANDOM%500)) 
  Y=0 
  while [ $Y -lt $X ] 
  do 
    ((Y++)) 
    INDEX=$(($RANDOM%$MODNUM))
  done
  echo -n "${CHAR_ARRAY[$INDEX]}" 
  ((PWD_LEN++)) 
done

echo ""

exit 0