quot.sed (153B)
1 s/"\([^"]*\)"/“\1”/g 2 s/`\([^`']*\)'/‘\1’/g 3 s/ '\([^`']*\)' / ‘\1’ /g 4 s/ '\([^`']*\)'$/ ‘\1’/g 5 s/^'\([^`']*\)' /‘\1’ /g 6 s/“”/""/g