Sign APK

sign.sh

#!/bin/sh

KEYSTORE=my.keystore
KEYSTORE_ALIAS=myalias
PASSWORD=password
APK=some.apk

if [ ! -f ${KEYSTORE} ]; then
    keytool -noprompt -genkey -v -keystore ${KEYSTORE} -alias ${KEYSTORE_ALIAS} -keyalg RSA -keysize 2048 -validity 1000 -dname "CN=frank" -storepass ${PASSWORD} -keypass ${PASSWORD} 
fi

jarsigner -sigalg SHA1withRSA -digestalg SHA1 -keystore ${KEYSTORE} -storepass ${PASSWORD} ${APK} ${KEYSTORE_ALIAS}
jarsigner -verify ${APK}