openssl x509 -in aps_development.cer -inform der -out DevPushCert.pem
openssl pkcs12 -nocerts -out DevPushKey.pem -in yourP12File.p12
openssl x509 -in aps.cer -inform der -out PushCert.pem
openssl pkcs12 -nocerts -out PushKey.pem -in yourP12File.p12
cat
on the terminal to get the content of your PEM filescat PushKey.pem