I did a transfer using the cli and now I want to view it in the https://xmrchain.net explorer. What do I need from me to decode the outputs so I can prove that I sent it? And what commands do I need in the cli to output these things to decode the transaction on the explorer page?
If you know the txid for your transaction:
And replace TXID with that transaction's txid.
Note that once you disclose that secret tx key to a third party, that third party can use it in the same way you do (ie, to try to prove they sent that tx).