$ < /dev/urandom tr -dc '!@#%*?^)('_A-Z-a-z-0-9 | head -c16;echo
$ < /dev/urandom tr -dc 'a-zA-Z0-9/_\-\.\!\/\:\%\+\?=&' | head -c16;echo
$ < /dev/urandom tr -dc ['a-zA-Z0-9/_\-\.\!\/\:\%\+\?=&'] | head -c16;echo
$ < /dev/urandom tr -dc [a-zA-Z\/]['a-zA-Z0-9/_\-\.\!\/\:\%\+\?=&'] | head -c16;echo

echo {0..9}
echo {a..z}
echo {A..Z}

echo -n '123' | base64

Ou

echo -n "Enter Password: " && head -1 </dev/stdin | base64

Decode

echo -n "MTIzCg==" | base64 --decode

echo -n "Enter Password: " && head -1 </dev/stdin | tr -d '\n' | sha256sum | cut -d" " -f1

echo -n "Dfi7bzCXPM@f" | md5sum | tr -d '-'

mkpasswd --method=SHA-512