The Stream Editor (sed)

The sed command is a powerful stream editor used for text manipulation. It can be used to perform various text transformations, such as finding and replacing text in files or streams.

The sed command is a powerful stream editor used for text manipulation. It can be used to perform various text transformations, such as finding and replacing text in files or streams.

Basic Syntax

sed 's/find/replace/' [file]

• s: Stands for "substitute."
• find: The text or pattern you want to search for.
• replace: The replacement text.
• file: The file you want to modify.

By default, sed prints the modified content to the terminal without changing the original file. You can use the -i option to edit files in-place.

Examples

Find and replace text in a file

sed 's/old/new/' file.txt

Example: File file.txt contains:

The old car is rusty.

Command:

sed 's/old/new/' file.txt