SED Tutorial Basic Substitution Linux Shell BASH | Use sed to substitute , replace & use sed as grep

SED Tutorial Basic Substitution Linux Shell BASH | Use sed to substitute, replace & use sed as grep. How to use sed, a special editor for modifying files automatically. If you want to write a program to make changes in a file, sed is the tool to use. There are a few programs that are the real workhorse in the Unix toolbox. These programs are simple to use for simple applications, yet have a rich set of commands for performing complex actions. Don’t let the complex potential of a program keep you from making use of the simpler aspects. This chapter, like all of the rest, start with the simple concepts and introduces the advanced topics later on.
A note on comments. When I first wrote this, most versions of sed did not allow you to place comments inside the script. Lines starting with the ‘#’ characters are comments. Newer versions of sed may support comments at the end of the line as well.

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