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These are my favourite switches on pwgen:
-B Don't include ambiguous characters in the password
-n Include at least one number in the password
-y Include at least one special symbol in the password
-c Include at least one capital letter in the password
It just works!
Add a number to set password length, add another to set how many password to output. Example:
pwgen -Bnyc 12 20
this will output 20 password of 12 chars length.
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