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(sed.info)Introduction

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Introduction
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   SED is a stream editor.  A stream editor is used to perform basic
text transformations on an input stream (a file or input from a
pipeline).  While in some ways similar to an editor which permits
scripted edits (such as ED), SED works by making only one pass over the
input(s), and is consequently more efficient.  But it is SED's ability
to filter text in a pipeline which particularly distinguishes it from
other types of editors.