These multiple choice questions address the "Finding Things" section in the Unix Shell lesson.

Formative Question

Which command would you use to find a string in any Python file on the file system?

• A. Command including find, but without grep.
• B. Command including both find and grep.
• C. Command including grep -r, but without find.
• D. Command including grep -r --include, but without find.

Summative Question

Which command would you use to find text files mentioned in text files?

• A. find . -name "*.txt" | grep .txt
• B. grep -r .txt
• C. grep .txt $(find . -name "*.txt")
• D. grep -w .txt $(find . -name "*.txt")

Explanation

• A. Demonstrates a misunderstanding of the way grep interacts with the pipe throughput. This answer greps the output of find as if it is one file.
• B. Demonstrates a misunderstanding of the difference between searching for text in all files and the search for text in a subset of files.
• C. Correct answer.
• D. Demonstrates a misunderstanding of the way grep arguments modify the search query.