2.sed "s/$a/$b/" filename
3.sed ’s/’$a’/’$b’/’ filename
4.sed s/$a/$b/ filename
2.sed "s/$a/$b/" filename
3.sed ’s/’$a’/’$b’/’ filename
4.sed s/$a/$b/ filename
2.sed "s/$a/$b/" filename
3.sed ’s/’$a’/’$b’/’ filename
4.sed s/$a/$b/ filename
2.sed "s/$a/$b/" filename
3.sed ’s/’$a’/’$b’/’ filename
4.sed s/$a/$b/ filename
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