Unleash the Power of Linux: Commands with a Twist

View File Content with Line Numbers

• Create a file: touch file_name

• Edit with Vim: vim file_name (Enter content, then esc :wq to save and exit)

• Display content: cat file_name

Set File Permissions for Owner Only

• Command: chmod 700 file_name

• Breakdown:

  • Owner: read (4) + write (2) + execute (1) = 7

  • Group/Others: no permissions (0)

Review Your Last 10 Commands

• Command: history | tail -n 10

Delete a Directory and Its Contents

• Command: rm -r directory_name

Create and Display a Fruits List

• Create file: touch fruits.txt

• Edit file: vim fruits.txt

• Display content: cat fruits.txt

• Alternatively: echo -e "Apple\nBanana\nCherry\nDate\nElderberry" > fruits.txt

Add and Append Content in devops.txt

• Add content: echo -e "Apple\nMango\nBanana\nCherry\nKiwi\nOrange\nGuava" > devops.txt

• Append: echo "Pineapple" >> devops.txt

Reverse the First Three Fruits

• Command: head -n 3 devops.txt | tac

Sort the Last Three Fruits Alphabetically

• Command: tail -n 3 devops.txt | sort

Create and Display a Colors List

• Command: echo -e "Red\nPink\nWhite\nBlack\nBlue" > colors.txt

Prepend "Yellow" to Colors.txt

• Command: echo "Yellow" > temp.txt | cat colors.txt >> temp.txt | mv temp.txt colors.txt

Find Common Lines Between Fruits and Colors

• Sort files: sort fruits.txt -o fruits.txt and sort colors.txt -o colors.txt

• Find common lines: comm -12 fruits.txt colors.txt

Count Lines, Words, and Characters

• Command: wc fruits.txt colors.txt