x=MM
sed 's/AB/'$x'/g' filename
或
sed 's/AB/'"$x"'/g' filename
sed 's/'"$val"'//' filename
awk '{ print "'$x'" }' filename
x=MM
sed 's/AB/'$x'/g' filename
或
sed 's/AB/'"$x"'/g' filename
sed 's/'"$val"'//' filename
awk '{ print "'$x'" }' filename
转载于:https://www.cnblogs.com/aquester/archive/2012/07/24/9891983.html