In the Lineage OS documentation (yes, it is related to Linux) theres:
All official builds from LineageOS are signed with our private keys. You can verify a build has been signed with our keys by running:
keytool -list -printcert -jarfile some-lineage-rom.zip
What role does
-list play here? I get the same result omitting
man keytool :
-list: Prints to stdout the contents of the keystore entry identified by alias. If no alias is specified, then the contents of the entire keystore are printed. This command by default prints the SHA1 fingerprint of a certificate
What does -list take as parameters?