Practising Shell Scripting
sed -i -e 's/root/ROOT/g' 's/admin/ADMIN/g' sample.txt
sed -i -e 'id' -e '/root/ d' sample.txt
sed -i -e '/root/ i Hello World' sample.txt
sed -i -e 's/root/ROOT/g' /tmp/passed
sed -i -e '2d' /tmp/passed
sed -i -e '/ROOT/d' /tmp/passed
sed -i -e '1 i Hello World' /tmp/passed
sed -i -e '1 a New World' /tmp/passed
sed -i -e '/World/ c Hello Universe' /tmp/passed