bash

Introduces the bash sed command for stream editing, showing how to replace strings in a file in place using the -e and -i options with a simple example.

Explains how to use the bash cat command to display and concatenate files, create here-documents, and use options like -t and -e, with practical examples.

Explains how to use the bash cut command to extract specific columns from tab- or space-delimited text files using the -d and -f options, with examples.