How does cat -b differ from cat -n?

The cat -b and cat -n options both add line numbers to the output of the cat command, but they do so in slightly different ways.

Differences:

1. Line Numbering Behavior:
   • cat -n: This option numbers all lines in the output, regardless of whether they are empty or not. Every line, including blank lines, will receive a number.
   • cat -b: This option only numbers non-empty lines. Blank lines are not numbered, which can make the output cleaner when you want to focus on the content without the distraction of numbers for empty lines.

Example:

Consider a file named example.txt with the following content:

First line
Second line

Fourth line

Using cat -n:

cat -n example.txt

Output:

     1  First line
     2  Second line
     3  
     4  Fourth line

Here, all lines, including the blank line, are numbered.

Using cat -b:

cat -b example.txt

Output:

     1  First line
     2  Second line

     3  Fourth line

In this case, only the non-empty lines are numbered, and the blank line remains unnumbered.

Summary:

• Use cat -n when you want to number every line, including blank ones.
• Use cat -b when you want to number only the lines that contain text, which can be more visually appealing and easier to read in certain contexts.

If you have any more questions or need further clarification, feel free to ask!