Command Line

Question 1

Remove files

Answer 1

rm file

Question 2

Remove directory

Answer 2

rmdir directoryname/path

Only removes empty directories

Question 3

change Directory

Answer 3

cd “DirectoryName/Sub”

Question 4

rename file

Answer 4

mv filename1 newfilename

put it in the same directory and it will rename the file

Question 5

list directory contents

Answer 5

ls

Question 6

remove directory with all contents

Answer 6

rm -r directoryname

Question 7

remove write-protected directory or file

Answer 7

rm directoryname -r -f

Question 8

How to find all text that contains “demo” in a file showing the line number

Answer 8

grep “demo” -n filename.txt

Question 9

Show the 2 most recently modified items in a directory

*Bonus to only show files and exclude directories

Answer 9

ls -t | head -2

1. -t sorts the listing in order of date created/modified with the most recent first
2. | head -2 pipes the output of ls to limit to the first 2 items

Bonus: ls -tp | grep -v / | head -2

1. -p appends the special char to directories “/”
2. grep -v / inverts the grep search to items that don’t contain “/”
3. head -2 only show the first to items

Question 10

What does the sudo command mean

Answer 10

sudo is short for super user do