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Sed is a stream editor that can be used in a command line interface (CLI) to modify text. It reads an input file, makes changes according to a set of commands, and prints the result to the standard output.

For example, to replace all occurrences of the word “foo” with the word “bar” in a file, you can use the following command:

sed 's/foo/bar/g' input.txt

This command will print the modified version of input.txt to the standard output. To save the output to a file, you can use the following command:

sed 's/foo/bar/g' input.txt > output.txt

The command consists of the following parts:

• s/foo/bar/g – this is the sed command that replaces all occurrences of “foo” with “bar”;
• input.txt – this is the name of the input file;
• > output.txt – this is the redirection operator that saves the output of the command to the file output.txt.

For more information about using sed, see the following links:

• Sed Tutorial
• Sed Man Page

onelinerhub: How can I use sed in a command line interface?