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# Create the files and folders for this example cat > my_file.txt << 'EOF' Understanding Shells A shell is a text-based interface that lets you talk to your computer. EOF cp my_file.txt copy_of_my_file.txt echo "My secret notes" > .my_secret_file printf 'name,score\nAnna,90\nBen,85\n' > report.csv truncate -s 720974 voiceover.wav truncate -s 2377702 Cosmere_RPG_Beta_Rules_Preview.pdf mkdir -p images myfolder/new_directory touch images/1.png images/2.png images/3.png images/4.png cp my_file.txt myfolder/ # Give the files different modification times touch -d "2025-01-15 20:38" Cosmere_RPG_Beta_Rules_Preview.pdf touch -d "2025-04-09 07:47" voiceover.wav touch -d "2025-04-09 07:48" report.csv my_file.txt touch -d "2025-04-09 07:50" copy_of_my_file.txt touch -d "2025-04-09 07:51" images touch -d "2025-04-09 07:52" myfolder ls -lh
total 12K
-rw-rw-r-- 1 20033 1001 92 Apr 9 2025 copy_of_my_file.txt
-rw-rw-r-- 1 20033 1001 2.3M Jan 15 2025 Cosmere_RPG_Beta_Rules_Preview.pdf
drwxrwxr-x 2 20033 1001 120 Apr 9 2025 images
-rw-rw-r-- 1 20033 1001 92 Apr 9 2025 my_file.txt
drwxrwxr-x 3 20033 1001 80 Apr 9 2025 myfolder
-rw-rw-r-- 1 20033 1001 26 Apr 9 2025 report.csv
-rw-rw-r-- 1 20033 1001 705K Apr 9 2025 voiceover.wav