Summary

Add -version option to keytool and jarsigner tools.

Problem

It would be useful to display the JDK version by a -version option for keytool and jarsigner tools. Many other JDK tools already provide a -version option.

Solution

Provide -version option in keytool and jarsigner that is used to print the program version of these tools.

Specification

Make the following changes to keytool manpage:

@@ -53,6 +53,8 @@ keytool - a key and certificate management utility

     -   `-showinfo`: Displays security-related information

+    -   `-version`: Prints the program version
+
     See [Commands and Options] for a description of these commands with their
     options.

@@ -184,6 +186,10 @@ perform.

 -   `-showinfo`

+[Commands for Displaying Program Version]\:
+
+-   `-version`
+
 ## Commands for Creating or Adding Data to the Keystore

 `-gencert`
@@ -1117,6 +1123,10 @@ perform.
     information. The `-tls` option displays TLS configurations, such as
     the list of enabled protocols and cipher suites.

+## Commands for Displaying Program Version
+
+You can use `-version` to print the program version of `keytool`.
+
 ## Commands for Displaying Help Information

 You can use `--help` to display a list of `keytool` commands or to display help

Make the following changes to jarsigner manpage:

@@ -17,6 +17,8 @@ jarsigner - sign and verify Java Archive (JAR) files

 `jarsigner` `-verify` \[*options*\] *jar-file* \[*alias* ...\]

+`jarsigner` `-version`
+
 *options*
 :   The command-line options. See [Options for jarsigner].

@@ -42,6 +44,9 @@ jarsigner - sign and verify Java Archive (JAR) files
 :   The aliases are defined in the keystore specified by `-keystore` or the
     default keystore.

+`-version`
+:   The `-version` option prints the program version of `jarsigner`.
+
 ## Description

 The `jarsigner` tool has two purposes:
@@ -779,6 +784,9 @@ the following standards:
     `jarsigner` arguments including the JAR file name and alias name(s) cannot
     be set in this file.

+`-version`
+:   Prints the program version.
+
 ## Deprecated Options

 The following `jarsigner` options are deprecated as of JDK 9 and might be