What Information Is Provided by the Echo $$ Command?
A) the Process ID of the Current Shell

question 60

Multiple Choice

What information is provided by the echo $$ command?

• A) The process ID of the current shell.
• B) The process ID for the following command.
• C) The process ID of the last command executed.
• D) The process ID of the last command which has been placed in the background.
• E) The process ID of the echo command. The process ID of the echo command.

---

Definitions:

External Validity

The extent to which the results of a study can be generalized or applied to other settings, populations, or times.

Internal Validity

The extent to which a study is able to produce evidence that its results are caused by the variables it is testing, free from external influence.

Correlational Method

A statistical technique used to determine the degree to which two variables are related without inferring a cause-and-effect relationship.

Confounding Variable

An extraneous variable in an experimental design that correlates with both the dependent and independent variables, potentially leading to a false assumption of causality.