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Produces secure passwords that satisfy most rules for secure passwords and can be customized for correct output as needed. See "man pwgen" for details.
There are 2 alternatives - vote for the best!
make password randomly, default 8 chars, using bash3.X only, no external program.
If you can do better, submit your command here.
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pwgen is a really good tool
It produces secure password that are not to hard to remember by default (use phonics).
The ultimate password:
pwgen -s -B -A -v -y 15 1
Good luck bruting that one!
I wrote (or found don't remember) a perl script about five years ago that did essentially the same thing, almost. http://pastebin.com/m6136311f
Still use it every day. I may be switching to this program thou. I like how extensible it is.