All categories

3 years ago

Which of the following is not a command for determining if MySQL is running on Linux (Ubuntu)?

Computers and Technology

1 answer:

laila [671]3 years ago

6 0

Answer:

Explanation:

The commands service, ps and systemctl, are different ways to find out if MySQL is running on Linux (Ubuntu), but there is not such a command called check to do so in Linux.

Different programs in Linux operating system are organized in processes, and they are all created for a specific purpose: running an application, starting a web browser, and so on.

Some other programs like the init program start and stop essential service processes and there are currently two major implementations in Linux distributions:

System V init (traditional implementation)
systemd (emerging standard for init).

The commands service and systemctl are related to System V init and systemd, respectively, and can list the status of a program.

Thus, the command service can list if MySQL is running on Linux using the piece of code in the question: sudo service mysql status.

Likewise, the command systemctl can activate and deactivate services, and, among many other functionalities, list the status of a program (like the one in the question: systemctl status mysql).

The command ps (process status) "displays information about a selection of the active processes" [ps man page]. The command has many options, and some are -e (select all processes) and -f (full-format listing). In this case, the command output is piped to grep (global regular expression print) command to find those processes mainly related to 'mysql'.

It is important to remember that command sudo (superuser do) permits a user to "execute a command as the superuser or another user" [sudo man page], since commands service and systemctl require privileges to be run, for security reasons.

You might be interested in

Write a program that first gets a list of integers from input. The input begins with an integer indicating the number of integer

dalvyx [7]

Answer:

The program is as follows:

def output_ints_less_than_or_equal_to_threshold(user_values, upper_threshold):

for i in user_values:

if i <= upper_threshold:

print(i,end=" ")

def get_user_values():

user_values = []

n = int(input())

for i in range(n):

num = int(input())

user_values.append(num)

upper_threshold = int(input())

output_ints_less_than_or_equal_to_threshold(user_values, upper_threshold)

get_user_values()

Explanation:

This defines the output_ints_less_than_or_equal_to_threshold method

def output_ints_less_than_or_equal_to_threshold(user_values, upper_threshold):

This iterates through user_values

for i in user_values:

For every item in user_values

if i <= upper_threshold:

This prints all items less than or equal to the upper threshold

print(i,end=" ")

This defines get_user_values method

def get_user_values():

This creates an empty list

user_values = []

This gets the number of inputs

n = int(input())

This iterates through n

for i in range(n):

This gets input for every item of the list

num = int(input())

This appends the input to the list

user_values.append(num)

This gets input for upper threshold

upper_threshold = int(input())

This calls output_ints_less_than_or_equal_to_threshold method

output_ints_less_than_or_equal_to_threshold(user_values, upper_threshold)

The main begins here; This calls get_user_values method

get_user_values()

4 0

3 years ago

Shania has started a new job as an app developer. Her first task was to make an old app designed for Android available on other

Fantom [35]

Answer:

B. Use cross-platform tools to write code that will translate the existing Android app code into different native formats.

Explanation:

Cross-platform application development tools are tools that can be used tool generate applications of different platforms, by just writing a single type of code. It has the ability to automatically create an application of a different platform from another.

A developer can develop an application like Android and convert it to IOS for Apple. Xamarin, Appcelerator coroner etc, are all examples of cross-platform tools.

8 0

4 years ago

Match the context details with the pattern that applies.

tia_tia [17]

Answer:

1. - Observer

2. - iterator

3. - strategy

4. - composite

5. - decorator

Explanation:

An object contains other objects (elements) and must give access to them for clients, without exposing its internal structure. This is an observation.

The subject-object can generate events as an iterable (iterator) and could use different strategic algorithms to achieve a task. Class objects can be used to aggregate other class objects.

In python, the decorator function mimics the outer function of a nested function, but still maintains the functionality of the second function

6 0

3 years ago

In a two-sided tag, a(n) ____ tag indicates the content's end.

alexira [117]

Answer:

A closing tag

Explanation:

A tag in HTML is the core building block that marks the presence of an element. If the element has text or another element within it, it is marked using a two-sided tag and in which case, the opening tag indicates the content’s beginning and a closing tag indicates the end of the content

7 0

3 years ago

Read 2 more answers

Use the variables k and total to write a while loop that computes the sum of the squares of the first 50 counting numbers, and a

pshichka [43]

Int k=0.total=0;
while(k++<50)
total+=k*k;

5 0

4 years ago