The command echo $! will produce what output?

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?
A . bg myapp

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

CORRECT TEXT
What command can put suspended jobs into the background?

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.

Which of the following sed commands will replace all instances of the string foo with the string
foobar changing the file file1.txt in place?

When reading man pages, a lot of extra characters are shown on screen. Which of the following
commands can help to deal with this problem?

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 commands is run last during boot on a system with quotas enabled?

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