Please do not use backtick characters (decimal 96, octal 0140, hex 0x60)
in shell scripts.  They do not nest, they are hard to read.  The default shell
/bin/bash offers replacements  $( ... )  and  $(< filename)  which are better.

     -F "machine_id="`cat /etc/machine-id` \

Replace with

        -F "machine_id="$(< /etc/machine-id) \

id="$(c=`(cat /etc/machine-id|echo nvme)|sha256sum`; echo ${c:0:32})"

That's a real bug.  'echo' fails as a pipeline.

  id="$(c=$(echo $(< /etc/machine-id)nvme | sha256sum); echo ${c:0:32})"
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