SC1122

cat << EOF
Hello
EOF | nl

cat << EOF | nl
Hello
EOF

You have a here document, and appear to have added text after the terminating token.

This is not allowed. If it was meant to continue the command, put it on the line with the <<.

If it helps, look at << "END" as if it was < file, and make sure the resulting command is valid. This is what the shell does. You can then append here document data after the command.

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