iControl iFileFile Issue

I found https://devcentral.f5.com/questions/possible-to-upload-overwrite-ifiles-using-icontrol

I had to do a couple things to make the upload work though. Here's my revised version:

!/bin/bash
filename=blah.txt
filesize=`wc -c < $filename`
echo $filesize
newfilesize=`expr $filesize - 1`
echo $newfilesize
filesize=$newfilesize

curl -k -u admin:admin \
  --trace trace.txt \
  --silent \
  --request POST \
  --header "Content-Type: text/plain" \
  --header "Content-Range: 0-$filesize/$filesize" \
  --data-binary "@$filename" \
  $filename | python -m json.tool