What does the command 'grep' do?

The command 'grep' is a powerful text search utility in Linux that is used to search for specific text patterns within files. It stands for "Global Regular Expression Print," and its primary function is to scan the content of files and return lines that match a specified pattern. Users can employ regular expressions to create complex search patterns, making 'grep' highly versatile for searching through logs, config files, and any textual data.

For instance, you might use grep "error" logfile.txt to find all occurrences of the word "error" within the logfile.txt. This capability is crucial for programmers, system administrators, and anyone needing to analyze text data efficiently.

The other options refer to different functionalities, such as printing the current directory path, copying files, or renaming files, which are not related to 'grep's' purpose of searching for patterns within texts.