# Very simple substitutions

clear
cat ussmall

sed 's/--/XXXX/' ussmall
sed 's/-/X/' ussmall


# using g to do global substitution

sed 's/-/X/g' ussmall


# Only perform the substitution on one line

sed '/Lehman/s/--/XX/' ussmall


# Other substition examples

sed '1,/Maggert/s/Maggert/Sluman/' ussmall
sed 's/Ernie/Burt/' ussmall