Part-3 linux

1. Use the cat command to create a file. Name of this file should be file1. Type a few sentences in this file. Save this file. Use the cat command one more time to display the content of file1.
2. Use vi command to add more lines to this file so you can answer the rest of these questions that uses regular expressions and grep command.
3. Select the lines from file file1 that have exactly three characters in them.
4. Select the lines from file file1 that have at least three characters in them.
5. Select the lines from file file1 that have three or less characters in them.
6. Select the non-blank lines from the file file1.
7. Select the lines from file file1 that start with a capital letter.
8. Select the lines from file file1 that end with a period.
9. Select the lines from file file1 that have the string unix.
10. Select the lines from file file1 that end with the string unix.
11. Select the lines from file file1 that have only the string unix.
12. Select the lines from file file1 that have the pattern unix at least two times.
13. Select the lines from file file1 that have the pattern unix and ends with unix.
14. Copy file file1 on the screen, but delete the blank lines.
15. Select the lines from file file1 that have a digit.
16. Select the lines from file file1 that have at least two digits without any other characters in between.