DANGER: This gives no more entropy than what srand() uses, which (at least for GNU awk) is simply the current UNIX time, which (if we assume that when you generated the password is known to within one year) means only about 25 bits of entropy.
srand in awk is platform specific. on most recent is isn't a straight call to srand().
I have another version that I use that stuffs srand but in the end I figured srand from a 250k dictionary is still better than picking words out of your head from a ~1k dictionary
