password generator
LC_ALL=C tr -dc 'A-Za-z0-9!?%=' < /dev/urandom | fold -w 20 | grep -m1 -P '^(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*[!?%=])'
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LC_ALL=C tr -dc 'A-Za-z0-9!?%=' < /dev/urandom | fold -w 20 | grep -m1 -P '^(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*[!?%=])'