For installation instructions see the Section called Installing Sed-4.0.7 in Chapter 6.
Sed (4.0.7):
ftp://ftp.gnu.org/gnu/sed/
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).
Installed program: sed
sed is used to filter and transform text files in a single pass.
Sed depends on: Bash, Binutils, Coreutils, Diffutils, GCC, Gettext, Glibc, Grep, Make, Texinfo.