What are the commands for these? (Introduction to Linux/Unix ?)

1. On a single line, create the following variables with the values given.

Variable a with the value 5

Variable b with the value 3

On another single command line, create the following variables with the values given.

Variable s1 with the value "foo"

Variable s2 with the value "foo"

Variable s3 with the value "bar"

Print all variables and their values to the terminal.

-Write a test expression that returns a value indicating true or false when testing whether a is equal to b. Echo the results of this test to the terminal.

-Write a test expression that returns a value indicating true or false when testing whether a is less than b. Echo the results of this test to the terminal.

-Write a test expression that returns a value indicating true or false when testing whether a plus b is greater than 9. Echo the results of this test to the terminal.

-Write a test expression that returns a value indicating true or false when testing whether s1 is equal to s2. Echo the results of this test to the terminal.

-Write a test expression that returns a value indicating true or false when testing whether s1 is not equal to s3. Echo the results of this test to the terminal.

-Write a test expression that returns a value indicating true or false when testing whether s1 has a length greater than 0. Echo the results of this test to the terminal.

-Write a test expression that returns a value indicating true or false when testing whether dir1 is a directory. Echo the results of this test to the terminal.

-Write one test expression that returns a value indicating true or false when testing whether empty.txt is readable and is writeable. Echo the results of this test to the terminal.