Sed:Stream EDitor

Sed

Stream EDitor. Will run ed style commands on files. The most common way to use it is for search and replace on the fly.

sed s/first/second/g returns the the first line second line

A network consists of several computers connected together. The network can be as simple as a few computers connected in your home or office, or as complicated as a large university network or even the entire Internet. When your computer is part of a network, you have access to those systems either directly or through services like mail and the web.

There are a variety of networking programs that you can use. Some are handy for performing diagnostics to see if everything is working properly. Others (like mail readers and web browsers) are useful for getting your work done and staying in contact with other people.