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All depends what you put in $a and $b :

if you use line number, you should not use the slash
a=2
b=4
sed $a,$b'!d' infilebut if you want to do your selection based on the pattern matching, then...

use double quote instead of simple one
and remove the slash by the way :

the more simple:
sed $a,$b'!d' infile

but those may also work:
sed ''$a,$b'!d' infile(4 simple quotes) or
sed...