Password Generator using linux RNG device

PassGen.sh

# Allow lowercase and uppercase digits and numbers and the underscore
 < /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c5;
 echo '';

# Allow more symbols:
 < /dev/urandom tr -dc _A-Z-a-z-0-9#.*$%^* | head -c10;
 echo '';

# And even more...
 < /dev/urandom tr -dc _A-Z-a-z-0-9#.*$%^*,+=-?/ | head -c10;
 echo '';

# Generate 5 random passwords of length 12
cat /dev/urandom| tr -dc 'a-zA-Z0-9-_!@#$%^&*()_+{}|:<>?=' |fold -w 12| head -n 5| grep -i '[!@#$%^&*()_+{}|:<>?=]'

# Using openssl:
 openssl rand 9 -hex # Hexadecimal output
 openssl rand 9 -base64 # Base64-encoded output

# Take the md5sum of the current timestamp
 date | md5sum
# and then take the Base64 of the output if you like:
 date | md5sum | base64

# Note: Replace /dev/urandom by /dev/random to generate an even "randomer" password
#       however it performs rather bad and you'll have to wait a looooot! So if you 
#       want a faster but yet more random solution use:
 dd if=/dev/random bs=1 count=20 | base64