keytool -help does not list all options.
keytool -help lists below options
==
>keytool -help
Key and Certificate Management Tool

Commands:

 -certreq            Generates a certificate request
 -changealias        Changes an entry's alias
 -delete             Deletes an entry
 -exportcert         Exports certificate
 -genkeypair         Generates a key pair
 -genseckey          Generates a secret key
 -gencert            Generates certificate from a certificate request
 -importcert         Imports a certificate or a certificate chain
 -importpass         Imports a password
 -importkeystore     Imports one or all entries from another keystore
 -keypasswd          Changes the key password of an entry
 -list               Lists entries in a keystore
 -printcert          Prints the content of a certificate
 -printcertreq       Prints the content of a certificate request
 -printcrl           Prints the content of a CRL file
 -storepasswd        Changes the store password of a keystore

Use "keytool -command_name -help" for usage of command_name.
Use the -conf <url> option to specify a pre-configured options file.
==

Missing options
1) -keystore keystore can be directly used with keytool, keytool -help doesn't mention about that
example - keytool -keystore $KS -genkey -dname CN=fmatte -storepass $PASSWORD

2) -import can be directly used to import certificate
example keytool -import -v -trustcacerts -alias keyAlias  -file server.cer -keystore cacerts.jks

3) -export can be directly used to export certificate to local file
example keytool -export -alias keyAlias-storepass changeit  -file server.cer  -keystore keystore.jks

4) -selfcert can be directly used for self signing certs

5) -genkey can be directly used for generating key