tee file1.txt <<EOF | wc -c
Line 1
Line 2
Line 3
EOF
# 21
printf 'blob 21\x00' > /tmp/blob1
cat file1.txt >> /tmp/blob1
sha1sum /tmp/blob1
# 6ad36e52f0002937ed2de6a1c15d8a0ae5df056a  /tmp/blob1
mkdir .git/objects/6a
deflate < /tmp/blob1 > .git/objects/6a/d36e52f0002937ed2de6a1c15d8a0ae5df056a
rm /tmp/blob1