Sed is known as a Stream Editor in that it can carry out various filtering and/or transforming functions on standard input or on user specified files. It is commonly used to search-and-replace in text files. If your question is about text-processing, this tag is likely to be appropriate

The sed command can search for, print and edit text from some stream, such as a file or standard input. It is often used as a search-and-replace tool.

Ubuntu uses the GNU version of sed

If you are asking a question about text processing, this tag is probably appropriate. If you want to transform some text, it is usually necessary to give a clear example of what you have as input and the output you want to achieve.

Related tags: