Sometimes you want to modify a file as part of the tasks run from a shell script. Although the use of sed to modify files on the fly is common, the use of ed is less familiar to many. ed is a line-oriented editor that works much like any other text editor. It opens a file, makes modifications, saves the changes, and exits. The advantage of using ed to script these interactive sessions is that the modification is performed directly on the file itself and the results are neither redirected to another file nor used to overwrite the file itself.
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