9) cat – View/concatenate files

• Function: Reads and joins files.

• Syntax:

  cat file.txt
  cat file1.txt file2.txt > combined.txt
  
  

• Lesson: Quick way to view file contents.

10) nano – Edit files

• Function: Opens file in Nano editor.

• Syntax:

  nano config.txt
  
  

• Lesson: Simpler than vi, good for beginners.

11) less / more – View large files

• Function: Opens files page by page.

• Syntax:

  less logfile.log
  more logfile.log
  
  

• Lesson: Easier to handle logs than using cat.

12) head / tail – View file beginning or end

• Function: Displays first or last lines.

• Syntax:

  head -n 5 file.txt
  tail -n 10 file.txt
  tail -f logfile.log
  
  

• Lesson: Crucial for log monitoring in real time.