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Combine the "head" and "tail" commands. Both have a "-c" options to specify number of bytes.
For your 10 MB example:
tail -c 8192 <filename>
Prints the last 8 MB (i.e. omit the FIRST 2 MB - 8192 bytes = 8 MB)
head -c 8192 <filename>
Prints the first 8 MB (i.e. omit the LAST 2 MB)
So to combine them in a pipeline you'd have to be cognizant of the difference (that is whichever command you did first would reduce the output to 8 MB so you'd need to change your byte count to be 8 MB - 2 MB = 6 MB:
tail -c 8192 <filename> |head -c 6144
The tail prints the last 8 MB and pipes it into head which prints only the first 6 MB of the 8 MB generated by tail.
Make sure you do the output to a test file before overwriting your original to be sure it contains what you want.
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