What are common cat command options?

Here are some common options for the cat command:

1. -n: Number all output lines.

   cat -n filename.txt

2. -E: Display a dollar sign ($) at the end of each line.

   cat -E filename.txt

3. -A: Show all non-printing characters (equivalent to -vET).

   cat -A filename.txt

4. -b: Number non-blank output lines.

   cat -b filename.txt

5. -s: Suppress repeated empty output lines.

   cat -s filename.txt

6. -T: Display TAB characters as ^I.

   cat -T filename.txt

7. -v: Use ^ and M- notation for non-printing characters, except for line feed and TAB.

   cat -v filename.txt

These options can be combined to customize the output according to your needs.