Linux：keytool说"Unrecognized command: -exportcert"

Question

在Facebook API的文档或Android开发人员的文档中提到，您应该使用keytool命令，例如：

keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore -list -v

但当你把它粘贴到终端时，你只能看到一个错误：

Unrecognized command: -exportcert
Usage:  keytool [COMMAND] [-- COMMAND]...
Manage private keys and public certificates.
Available commands:
  -genkey         Generate a Key Entry, eventually creating a key store.
                    [-alias ALIAS] [-keyalg ALGORITHM] [-keysize KEY_SIZE]
                    [-sigalg ALGORITHM] [-dname NAME] [-keypass PASSWORD]
                    [-validity DAY_COUNT] [-storetype STORE_TYPE]
                    [-keystore URL] [-storepass PASSWORD]
                    [-provider PROVIDER_CLASS_NAME] [-v].
  -import         Add Key Entries and Trusted Certificates.
                    [-alias ALIAS] [-file FILE] [-keypass PASSWORD]
                    [-noprompt] [-trustcacerts] [-storetype STORE_TYPE]
                    [-keystore URL] [-storepass PASSWORD]
                    [-provider PROVIDER_CLASS_NAME] [-v].
  -selfcert       Generate a self-signed Trusted Certificate.
                    [-alias ALIAS] [-sigalg ALGORITHM] [-dname NAME]
                    [-validity DAY_COUNT] [-keypass PASSWORD]
                    [-storetype STORE_TYPE] [-keystore URL]
                    [-storepass PASSWORD] [-provider PROVIDER_CLASS_NAME] [-v].
  -identitydb     NOT IMPLEMENTED YET.  Import JDK1.1 Identity Database.
                    [-file FILE] [-storetype STORE_TYPE] [-keystore URL]
                    [-storepass PASSWORD] [-provider PROVIDER_CLASS_NAME] [-v].
  -certreq        Issue a Certificate Signing Request (CSR).
                    [-alias ALIAS] [-sigalg ALGORITHM] [-file FILE]
                    [-keypass PASSWORD] [-storetype STORE_TYPE] [-keystore URL]
                    [-storepass PASSWORD] [-provider PROVIDER_CLASS_NAME] [-v]
                    [-attributes].
  -export         Export a Certificate from a key store.
                    [-alias ALIAS] [-file FILE] [-storetype STORE_TYPE]
                    [-keystore URL] [-storepass PASSWORD]
                    [-provider PROVIDER_CLASS_NAME] [-rfc] [-v].
  -list           Print one or all Certificates in a key store to STDOUT.
                    [-alias ALIAS] [-storetype STORE_TYPE] [-keystore URL]
                    [-storepass PASSWORD] [-provider PROVIDER_CLASS_NAME] 
                    [-rfc] [-v].
  -printcert      Print a human-readable form of a Certificate in a FILE.
                    [-file FILE] [-v].
  -keyclone       Clone a Key Entry in a key store.
                    [-alias ALIAS] [-dest ALIAS] [-keypass PASSWORD]
                    [-new PASSWORD] [-storetype STORE_TYPE] [-keystore URL]
                    [-storepass PASSWORD] [-provider PROVIDER_CLASS_NAME] [-v].
  -storepasswd    Change the password protecting a key store.
                    [-new PASSWORD] [-storetype STORE_TYPE] [-keystore URL]
                    [-storepass PASSWORD] [-provider PROVIDER_CLASS_NAME] [-v].
  -keypasswd      Change the password protecting a Key Entry in a key store.
                    [-alias ALIAS] [-keypass PASSWORD] [-new PASSWORD]
                    [-storetype STORE_TYPE] [-keystore URL]
                    [-storepass PASSWORD] [-provider PROVIDER_CLASS_NAME] [-v].
  -delete         Delete a Key Entry or a Trusted Certificate from a key store.
                    [-alias ALIAS] [-storetype STORE_TYPE] [-keystore URL]
                    [-storepass PASSWORD] [-provider PROVIDER_CLASS_NAME] [-v].
  -cacert         Import a CA's Trusted Certificate.
                    [-file FILE] [-storetype STORE_TYPE] [-keystore URL]
                    [-storepass PASSWORD] [-provider PROVIDER_CLASS_NAME] [-v].
Standard options:
      -help       print this help, then exit
      -version    print version number, then exit
  -JOPTION        pass argument to the Java runtime
Please report bugs at http://www.gnu.org/software/classpath/bugs.html

出了什么问题，我该如何解决？我正在运行Linux Mint 17.2 Cinnamon。

Answer 1

问题是有两个不同的工具具有相同的名称"keytool"。

一个是您的linux发行版附带的，当您在终端中编写"keytool"命令时，默认情况下会使用它。当您运行man keytool时，您可以看到描述：

NAME
       gkeytool - Manage private keys and public certificate

但出于您的目的，需要使用Java安装附带的密钥工具——您必须定位到Java目录，对我来说，它位于/opt/java/jdk1.8.0_65/bin中。当您在这里时，只需运行相同的命令，但在命令开头使用./keytool而不是keytool，例如：

./keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore -list -v