It's a Host key they sent out to all partners.
I see the command to remove previous key. 
Don't I need a command to store the new key?
This sftp is embedded within a large batch process - I could (if need to) piece together the script to do it interactively. 
Jim 
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxxxxxxxx] On Behalf Of Kevin Adler
Sent: Saturday, February 23, 2019 4:31 PM
To: midrange-l@xxxxxxxxxxxxxxxxxx
Subject: Re: sftp partner has new public key
   What type of key is it? Host key or user key?
    
   If it's a host key (you're connecting to them), you can use the following
   command to remove their entries from the current user's known_hosts file:
    
   ssh-keygen -R remote-hostname.example.com
    
   Once that is done, the next time you connect it will ask you to validate
   the remote key.
    
    
   If it's a user key (they're connecting to you), they (or you) will need to
   add their public key to the remote user's authorized_keys file. ie
   $HOME/.ssh/authorized_keys
    
   It's merely a copy/paste operation, however there are caveats: it must be
   done in ASCII mode *and* must have Unix line endings.
    
     ----- Original message -----
     From: "midrange" <franz9000@xxxxxxxxx>
     Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxxxxxxxx>
     To: <midrange-l@xxxxxxxxxxxxxxxxxx>
     Cc:
     Subject: sftp partner has new public key
     Date: Sat, Feb 23, 2019 3:17 PM
      
     Set up sftp years ago with public/private key authentication.
     Partner has new public key.
     When I read various IBM docs, it only seems to start from scratch.
     Is there a command (Pase I assume) to just update a partner's public
     key?
     V7R3
     Jim
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