How to pass command from stdin?

vim -E -c "normal gg=G" -c "x" file

The above code indent the file from command line. But the following
one can not do so.

vim -E file <<EOF
:normal gg=G
:x
EOF


It seems that I should be able to pass command from stdin. I'm not
sure why it is not working. Could anybody let me know?

Thanks,
Peng

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