Thanks. I had actually installed pwgen a few months ago, but it looked like the passwords
weren't strong enough. gnome-password-generator has a Character set option "All
printable (excluding space)". It appears that "pwgen -sy 30 1", for
example, does just that, and "pwgen -s 30 1" is the same as "Alphanumeric
(a-z, A-Z, 0-9)". I use a password manager, so only care about maximum entropy. It
would be really nice if there was something where you could specify an exact set of
characters to either include or exclude, to cope with certain websites that allow only
some special characters.