I am trying to find my keytool so that I can make keys to sign my app and to register for the google maps api
I'm beginning to think that I don't actually have it on my machine
If anyone could help point me in the right direction that would be great
If you are using Eclipse under Mac OS X you just need to
Select File -> Export -> select Android -> Export Android Application -> click next -> select your project -> click next -> here you just chose Create new keystore
To answer the original question, on my Mac, keytool is found at /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/bin/keytool.
You can locate the Java home directory using the /usr/libexec/java_home command line tool on Mac OS X 10.5 or later.
The actual tool should be installed all ready, as to my knowledge it ships with the MAC. You then have to create the .keystore file http://www.androiddevelopment.org/tag/keytool/ shows how to do it
I did the following and it worked for me:
/Library/Java/JavaVirtualMachines/jdk1.8.0_161.jdk/Contents/Home/bin/keytool -genkey -v -keystore my-release-key.keystore -alias my_keystone -keyalg RSA -keysize 2048 -validity 10000jarsigner -verbose -sigalg SHA256withRSA -digestalg SHA1 -keystore my-release-key.keystore app-release-unsigned.apk my_keystone/Users/developer/Library/Android/sdk/build-tools/28.0.3/zipalign -v 4 app-release-unsigned.apk nameapp.apk
来源：https://stackoverflow.com/questions/7292832/cannot-find-keytool-on-a-mac