The gzip quine described above, selfgz.gz, has 210 bytes. Here's a shorter one, with 112 bytes:
( echo H4sIAEMHJV0CA5Pv5mCIeLzKnIGZgYHh/38GEYbX/+WxiDl1 ;
echo KB5hIIJ1TXfrBNeU3DznNGYG78SS1AKgEchsAEthdGVwAAAA ) |
base64 -d | gunzip > quine.gz
zcat quine.gz | diff - quine.gz
There is probably an even shorter one.
There's a good discussion of the theory of LZ quines here:
https://research.swtch.com/zip
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