sed

Website: http://www.gnu.org/software/sed/

sed (stream editor) is a non-interactive command-line text editor for filtering and transforming text. It processes text line by line, applying editing commands defined by the user, making it ideal for batch file editing, find-and-replace operations, and text processing pipelines.

Key Features

• Find and Replace — Substitute text patterns across files or streams
• In-Place Editing — Edit files directly with -i flag
• Line Addressing — Apply commands to specific line ranges
• Script Support — Run complex editing scripts from files
• Regular Expressions — Full regex support for pattern matching

Platform

Linux, macOS, BSD, Windows (via WSL/Cygwin)

Licence

GNU General Public License v3

Website

http://www.gnu.org/software/sed/