Text ProcessingLesson 19Free preview

Bash Stream Editor (sed)

This lesson is part of Bash · All levels

Summary

The sed command modifies the flow of text line by line, generally to search for and replace text. Substitution orders are in the form of old text and can be limited to a certain line. With the -i option, the changes are written directly to the file, so you'd better back it up first.

Key points

Sed 's/long/new/' file changes patterns per line
I save the changes directly to the file.
n added p option p to display the selected line
Addresses like 1.3 or / say / restrict the work area

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