Why should you always enclose your `grep` search pattern in single quotes? (e.g. `grep -v '\?*' file` as opposed to `grep -v \?* file`)

Some shell metacharacters are also regular expression characters, so `grep` could get confused when interpreting the command string. Quoting them makes `grep` ignore them and pass the literal characters to `bash`.

They are required by `bash`.

Some regular expression characters are also shell metacharacters and `bash` could get confused when interpreting the command string. Quoting them makes `bash` ignore them and pass the literal characters to `grep`

They are required by `grep`.

2 ) What does the command `cp file.txt mydir/` do?

	a.	renames file.txt to mydir/
	b.	creates a copy of file.txt inside the mydir directory
	c.	creates a copy of mydir called file.txt
	d.	moves file.txt into the mydir directory

3)

When you see the command `rm -rf `, what thought should go through your head?

		Shouldn't that be `rm -rf /`... or was it `rm -rf *`?
		"12:50, press return"
		"Danger, Will Robinson!"
		Good thing I'm logged in as root!
		I read it on the Internet, so it must be right.