sed (Stream Editor) is a powerful command-line tool in Unix and Linux used for parsing and transforming text. It operates on input text streams (files or standard input) and allows users to perform various text manipulations, such as:
- Substitution: Replacing specific text patterns with new text.
- Deletion: Removing lines or specific patterns from the text.
- Insertion: Adding new lines or text at specified locations.
- Pattern Matching: Selecting lines based on specific patterns using regular expressions.
sed can be used for both simple tasks, like replacing a word, and complex text processing tasks, such as batch editing multiple files with a script. It is commonly used in shell scripts and for automating text processing tasks.
