![]() ![]() It then performs all actions specified for the line and places the line back in memory to dump to the terminal with the requested changes made. The sed utility works by sequentially reading a file, line by line, into memory. With very little argument, sed is one of the most useful tools in the Linux and UNIX tool chest. The parameters can be as limited as those needed for a one-time use of a simple operation, or as complex as a script file filled with thousands of lines of editing changes to be made. Smith" or "tiger cub" to "wolf cub." The stream editor is ideally suited to performing repetitive edits that would take considerable time if done manually. It can be used to change all occurrences of "Mr. As such, it flows through text as water would through a stream, and thus sed fittingly stands for stream editor. sed accepts a series of commands and executes them on a file (or set of files) noninteractively and unquestionably. When you visualize it, forget any ability to interactively edit files as you would do with Microsoft Word or most other editors. This means you have to insert commands to be executed on the data at the command line or in a script to be processed. In addition to not being screen-oriented, it is also noninteractive. The sed utility is an "editor," but it is unlike most others. It is one of the most powerful tools in any administrator's toolkit and can prove itself invaluable in a crunch. One utility that can simplify life in key situations is sed. There are so many different utilities, in fact, that it is next to impossible to know and understand all of them. One of the best things about the Linux operating system is that it is crammed full of utilities. ![]()
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