What happens when you give the following commands if the file named done already exists?
$ cp to_do done
$ mv to_do done
2.Which command can you use to look at the first few lines of a file named status.report? Which command can you use to look at the end of the file?
3.Try giving these two commands:
$ echo cat
$ cat echo
Explain the differences between them.
4.Is each of the following an absolute pathname, a relative pathname, or a simple pathname?
Milk_co
Correspond/business/milk_co
/home/alex
/home/alex/literature/promo
..
letter.0610

5.List the commands you can use to perform these operations:
Make your home directory the working directory
Identify the working directory
6.What does the shell ordinarily do while a command is executing? What should you do if you do not want to wait for a command to finish before running another command?
7.Assume that the following files are in the working directory:
$ ls
intro notesb ref2 section1 section3 section4b


notesa ref1 ref3 section2 section4a sentrev

Give commands for each of the following, using wildcards to express filenames with as few characters as possible.

List all files that begin with section.
List the section1, section2, and section3 files only.
List the intro file only.
List the section1, section3, ref1, and ref3 files.