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cc=`hd -bx -s 29 -n 3 <"$filename"|tr -d '[ " " ]'|awk '{print $2}'`

hd-- display files in a hexadecimal format
hd [ -format (bx is binary)] [ -s(offset)] [-n (count)] [filename]
tr - translate characters
the -d Deletes all input characters in the input string.