chap 3

5. Command that is safe to use on binary files and text files.
7. also known as folders
12. Command used to display the end of a text file.
13. Command does not interpret any regular expressions and consequently returns results much faster.
15. Command used to view first few lines of a large file.
17. can include up to 255 characters, yet are rarely longer than 20 characters on most Linux systems.
19. Command to display a file in reverse order.
20. like the more command it can browse the contents of a text file page-by-page.

1. print working directory
2. Command used to display lines in a text file that match a certain common regular expression.
3. Command gets its name from the pg command once used on UNIX systems. The pg command displayed a text file page-by-page on the terminal screen.
4. to open a text file for editing you type this first.
6. Command to identify the content differences between two text files.
8. change directory
9. Command searches for text characters in a binary file and outputs them to the screen.
10. Command to display the file type of any file.
11. Command to view files and subdirectories under a directory.
14. Used to display lines of text that match extended regular expressions.
16. Command to view an entire text file on the terminal screen.
18. Command to display additional details for a file, including date and time a file was create, last time file was accessed, its content modified, or file info changed.
20. The most common method of displaying files