jarsigner:tldr:daf4c

The command you posted is using the "jarsigner" utility in a shell script or command line environment. Here's an explanation of the command structure:

jarsigner ${filename-jar} ${keystore_alias}

• jarsigner: This command is used in Java Development Kit (JDK) to sign and verify Java archive (JAR) files. It is mainly used to associate digital certificates with JAR files.

• ${filename-jar}: It is a placeholder for the filename of the JAR file you want to sign. You need to replace ${filename-jar} with the actual JAR file name (including its path if necessary). For example, if your JAR file is named "app.jar", you would replace ${filename-jar} with "app.jar".

• ${keystore_alias}: This is another placeholder for the keystore alias. The keystore is a secure storage where cryptographic keys and their corresponding certificates are stored. You need to replace ${keystore_alias} with the actual alias used for the private key and certificate within the keystore. If you have a keystore with an alias named "myalias", you would replace ${keystore_alias} with "myalias".

After replacing the placeholders with actual values, the command becomes:

jarsigner app.jar myalias

This instructs the "jarsigner" utility to sign the "app.jar" file using the private key and certificate associated with the "myalias" alias in the keystore.