To give you a taste of the power behind sed, I will consider the case of a developer that needs to add a license header on top of each of the source files in her project: :~$ head MIT.LICENSE *.sh Learn basic SED commands with these examples As a personal addition, I would say sed is particularly well suited for repetitive tasks like when you want to apply the same transformation to a set of files. The goal designs (1) and (3) are probably less relevant with our modern hardware, but the second one remains valid. To perform multiple `global’ editing functions efficiently in one pass through the input.To edit any size file when the sequence of editing commands is too complicated to be comfortably typed in interactive mode.To edit files too large for comfortable inter- active editing.Sed is designed to be especially useful in three cases: Sed is a non-interactive context editor that runs on the UNIX operating system. McMahon, the core developer of the original implementation in his original sed paper: The best description of the tool’s design goals comes from Lee E. That means you specify ahead of time the transformations you want to apply to a file, and then the tool can apply those transformations unsupervised. However, contrary to the text editors you may have already used, this is a non-interactive one. As any text editor, it will help you to modify text files. Sed is part of the Unix standard toolbox since the end of the 60s.
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