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The sed FAQ
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4.24. How do I address all the lines between RE1 and RE2, excluding the lines themselves?

Normally, to address the lines between two regular expressions, RE1 and RE2, one would do this: '/RE1/,/RE2/{commands;}'. Excluding those lines takes an extra step. To put 2 arrows before each line between RE1 and RE2, except for those lines:

     sed '1,/RE1/!{ /RE2/,/RE1/!s/^/>>/; }' input.fil

The preceding script, though short, may be difficult to follow. It also requires that /RE1/ cannot occur on the first line of the input file. The following script, though it's not a one-liner, is easier to read and it permits /RE1/ to appear on the first line:

     # sed script to replace all lines between /RE1/ and /RE2/,
     # without matching /RE1/ or /RE2/
     #---end of script---
Contents of input.fil: Output of sed script:
aaa aaa bbb bbb RE1 RE1 aaa >>aaa bbb >>bbb ccc >>ccc RE2 RE2 end end
The sed FAQ
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   Reprinted courtesy of Eric Pement. Also available at Design by Interspire