Sed is a stream editor, it is not really a text editor, true or processor.Instead text, is used to filter text, ie, it takes text input and performs an operation (or set of operations) on it and outputs the modified text.Sed is generally used to extract a portion of a file using the filter or replace multiple occurrences of a string within file.Installation: The simplest way to compile this package is: 1. "Cd" into the directory containing the package's source code and type `. / Configure 'to configure the package for your system. If you use `csh 'on an old version of System V, you might need to type` sh. / Configure 'instead to prevent `csh' from trying to execute` configure configure ' `itself.Running' takes some time. While running, it prints some messages telling features, he is checking for.2. Type `make 'to compile the package.3. Optionally, type `make check 'to run any self-tests that come with the package.4. Type `make install 'to install programs and data files and documentation.5. You can remove the binaries and object files from source code directory by typing `make clean '. To also remove the `configure 'created (you can compile the package for a different type of computer), type` make distclean'. There is also a `make maintainer-clean 'target, but is mainly aimed at developers of the package. If you are using, you may have to get all sorts of other programs in order to regenerate files provided with the distribution.