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usage: sitepass MaStErPaSsWoRd example.com
description: An admittedly excessive amount of hashing, but this will give you a pretty secure password, It also eliminates repeated characters and deletes itself from your command history.
tr '!-~' 'P-~!-O' # this bit is rot47, kinda like rot13 but more nerdy
rev # this avoids the first few bytes of gzip payload, and the magic bytes.
There are 5 alternatives - vote for the best!
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keepassx will generate passwords, and also store them securely. It is a nice program and worth checking out.
pwgen is another good tool. Allows you customize the type and number of passwords you want to be generated.