What does the command mount -a do?

Select the line that best represents what permissions the /etc/passwd file should have

Which of the following commands is run last during boot on a system with quotas enabled?

Which of the following commands will send output from the program myapp to both standard
output (stdout) and the file file1.1og?

Which of the following sed commands will replace all instances of the string foo with the string
foobar changing the file filel.txt in place?

Which shell built-in command can be used to create a shortcut or pseudonym for a longer
command?
Assume a modern bourne-like shell, such as bash.

In order to append the output of ls to a file called bazz, which of the following command lines
would you use?

What command will print a list of usernames (first column) and their corresponding user id (uid,
third column) from /etc/passwd?

Given the following output:
Prompt > myapp
[1]+ Stopped myapp
prompt>
Which of the following commands will resume executing the stopped process while allowing the
user to continue to type commands at the command prompt?