The awk command is a powerful text manipulation tool that is native to Unix-based systems. It's designed for performing text processing tasks such as filtering, transformation, and analysis.

sed stands for Stream Editor, and it is an essential utility that allows you to perform basic text transformations on an input stream (either a file or input from a pipeline).

grep is a command-line tool used for searching for text patterns in files or streams of input.

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cd, pwd, find, mkdir, and rmdir commands are commonly used in the command-line interface and can help users perform various file and directory operations efficiently.