modernleft-docs/Docker Images/quartz/use xxd in docker.md

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```bash
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# on host
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docker run --rm -it alpine:latest sh
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# in container
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apk add xxd openssl
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# everything after this is one command
echo PDS_PLC_ROTATION_KEY_K256_PRIVATE_KEY_HEX: $(openssl ecparam --name secp256k1 --genkey --noout --outform DER | tail -c +8 | head -c 32 | xxd --plain --cols 32)
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```