How to un-delegate and get key deposit back?

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4

I found the answer myself. The key is to call “cardano-cli stake-address deregistration-certificate”. Below is the full commandline.

cardano-cli stake-address deregistration-certificate \
    --stake-verification-key-file stake.vkey \
    --out-file stake.cert

And then build a transaction with this certificate. Specifically you need to increase the change amount by 2 ADA and minus the transaction.

txOut=$((${total_balance}+${keyDeposit}-${fee}))
cardano-cli transaction build-raw \
    ${tx_in} \
    --tx-out $(cat payment.addr)+${txOut} \
    --invalid-hereafter $(( ${currentSlot} + 10000)) \
    --fee ${fee} \
    --certificate-file stake.cert \
    --mary-era \
    --out-file /tmp/tx.raw
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