Install Sed by running the following commands:
root:sed-3.02# ./configure --prefix=/usr
root:sed-3.02# make
root:sed-3.02# make install
root:sed-3.02# mv /usr/bin/sed /bin
The Sed package contains the sed program.
sed is a stream editor. A stream editor is used to perform basic text transformations on an input stream (a file or input from a pipeline).