You can access a full-screen TTY session by holding down the Ctrl+Alt keys, and pressing one of the function keys. Ctrl+Alt+F3 will bring up the login prompt of tty3. If you log in and issue the tty command, you'll see you are connected to /dev/tty3.
Explanation:
- tty2 is short for teletype, but it's more popularly known as terminal.
- It's basically a device (implemented in software nowadays) that allows you to interact with the system by passing on the data (you input) to the system, and displaying the output produced by the system
- You can either : press ctrl+alt+F7 Or run the command startx if the above commands do not work.
- The tty command of terminal basically prints the file name of the terminal connected to standard input.
- In Linux, there is a pseudo-teletype multiplexor which handles the connections from all of the terminal window pseudo-teletypes (PTS). The multiplexor is the master, and the PTS are the slaves.
- The multiplexor is addressed by the kernel through the device file located at /dev/ptmx.
- The -s (silent) option causes tty to generate no output.
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Answer:
D. End-User Programmer.
Explanation:
A stack data structure is used to holds data for programs. The first data to go into a stack is always the last to be extracted (First-in-Last-out). Data is read into the stack with the push function and retrieved with the pop function.
When the stack is empty, it means there are no data left to pop from it. If a pop function is issued at this time, the program conventionally throws an error, there is no need for the end-user to write an exception handler for it because the end-user programmer has done that already.
Answer:
- def average_num_in_file(fileName):
- with open(fileName) as file:
- rows = file.readlines()
-
- sum = 0
- count = 0
- for x in rows:
- sum += float(x)
- count += 1
-
- average = sum / count
- return average
-
- print(average_num_in_file("cans.txt"))
Explanation:
The solution code is written in Python 3.
Firstly create a function that take one parameter, fileName (Line 1).
Open the file stream and use readlines method to read the data from the file (Line 2-3). Create variable sum and count to tract the total of the number from text files and number of data from the file (Line 5-6). Use a for loop to loop over each row of the read data and add the current value of each row to sum and increment the count by one (Line 7-9).
After the loop, calculate the average (Line 11) and return the result (Line 12).
At last, we can test the function by passing the cans.txt as argument (Line 14).
