I've a .img file containing two partitions. I'd like to shrink one 
partition (that is ext4) and so create a smaller .img file to burn to an 
SD card that is smaller than the current .img file. There is sufficient 
space for the reduction. However I can't work out how to shrink it when 
it is offline (it refuses to shrink it while online on a loop device) 
because it doesn't appear as though resize2fs can take a file or an 
offset. Can anyone suggest how I might do this?
Thanks,
Leo
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