Bash Guide for Beginners
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Chapter 5. The GNU sed stream editor
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5.4. Summary
The sed stream editor is a powerful command line tool, which can handle streams of data: it can take input lines from a pipe. This makes it fit for non-interactive use. The sed editor uses vi -like commands and accepts regular expressions.
The sed tool can read commands from the command line or from a script. It is often used to perform find-and-replace actions on lines containing a pattern.
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