## Format an APFS (MAC) hard disk on Windows

1. Launch a new Command Prompt (cmd)
2. Type the command diskpart
3. type list disk and note the number of the APFS formatted disk
4. type select disk X where X is the number noted in step 3
5. type clean. Now the drive doesn’t have partitions anymore, it’s just an unallocated space.
6. Type `create partition primary`
7. To format type `format quick fs=ntfs`
8. Type `assign ``letter=`X

``````keytool -genkey -v -keystore MY-RELEASE-KEY.keystore -alias MY_ALIAS_NAME -keyalg RSA -keysize 2048 -validity 10000 -storetype jks

keytool -v -list -keystore MAAS-RELEASE-KEY.keystore

## Calculate Hamming, Manhattan and Minkowski Distance

``````# calculate hamming distance
from math import sqrt

def hamming_distance(x, y):
return sum(abs(a1 - a2) for a1, a2 in zip(x, y)) / len(x)

# define data
rowA = [0, 1, 0, 1, 0, 1]
rowB = [0, 1, 0, 0, 1, 0]
# calculate distance
result = hamming_distance(rowA, rowB)
print(result)

# calculate manhattan distance
def manhattan_distance(x, y):
return sum(abs(a1-a2) for a1, a2 in zip(x, y))

# define data
rowA = [10, 30, 45, 10, 5]
rowB = [12, 24, 18, 8, 7]
# calculate distance
result = manhattan_distance(rowA, rowB)
print(result)

# calculate minkowski distance
def minkowski_distance(x, y, z):
return sum(abs(a1-a2)**z for a1, a2 in zip(x, y))**(1/z)

# define data
rowA = [20, 40, 25, 30, 5]
rowB = [12, 10, 18, 10, 7]
# calculate distance (z=1)
result = minkowski_distance(rowA, rowB, 1)
print(result)
# calculate distance (z=2)
result = minkowski_distance(rowA, rowB, 2)
print(result)
``````

## Convert Let’s Encrypt SSL certificates from pem to crt/key

openssl rsa -in <path_to_privkey.pem> -pubout > key.pub

openssl rsa -outform der -in privkey.pem -out privkey.key

openssl x509 -outform der -in fullchain.pem -out fullchain.crt

openssl x509 -outform der -in cert.pem -out cert.crt

``openssl x509 -in cert.pem -outform pem -outform der -out cert.cer``