Howto generate a random password i an jiffy!
The following one-liner will generate a random eight character string consisting of numbers as well as upper- and lowercase letters.
echo `< /dev/urandom tr -dc A-Za-z0-9 | head -c8`
or
tr -dc '0-9a-zA-Z' </dev/urandom |head -c8; echo
If you need a shorter or longer password you can ajust the “-c8”-value.
And yes, I know…… a password should contain special characters as well. Please feel free to add a few periods and asterisks 
I found this on the net somewhere. I don’t remember where – sorry.