III. [20] Explain Commands 1. [5] What does the following command do? grep "^[^AB]"*.? What does the following command do? urt new.txt 2. [5] What does the following command do? sed 's/Nick/John/' report.txt > report new.txt 3. [4] What is the file permission for DIY 3. [4] What is the file permission for -rwx