os x command line random password generator

If you want a quick little random password generator (uppercase, lowercase, and numbers) from the terminal in OS X you can add something like this to your .bashrc

randompass() {

        LANG=C

        local l=$1

        [ “$l” == “” ] && l=12

        tr -dc A-Za-z0-9_ < /dev/urandom | head -c ${l} | xargs

}

It defaults to 12 characters but takes any numeric argument.  So usage to create a 21 character random password would be
randompass 21
Make sure to source .bashrc after you add that to give it a try.  If you haven’t already created .bashrc and .bash_profile on your Mac, do that first and then add in the following to .bash_profile
source ~/.bashrc
This will also work for any other *nix as well.