Obtain public key

[Martin]

Is there any way to obtain the public key from the private key?
I know it's in host file however for the purpose of this message I need to
be able to generate it on the command line.
I tried

openssl ec < ed25519_key.priv

I get an error

read EC key
unable to load Key
140092556813984:error:0906D06C:PEM routines:PEM_read_bio:no start
line:pem_lib.c:703:Expecting: ANY PRIVATE KEY
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