Echo is a common Linux command used to output prompts in the Shell.

echo "Hello World"
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Add the -n argument to remove the newline at the end of the echo command. The echo command can also output some colorful content to make the shell output more intuitive.

Echo is an echo in English. It means that when you call from this side of the mountain, all you hear is the echo in the valley. Fading away, looming, looming.

The origin of

It all starts with Greek mythology. After two generations of tumultuous history, the Titan protoss have now arrived in the world ruled by Zeus. It is well known that Zeus’ killer weapon was thunder, and he was a gunner. His characteristic characteristic is amorous, besides seven wives, have numerous affairs. For both men and women.

One of the seven wives was Hera, the only queen. Jealousy is typical of her. So when Zeus cheats, he usually hides from her. Aquarius, for example, was made by a beautiful boy who was set to die by Hera. Even her husband’s best gay friend, such a horrible woman.

This was the world of gods, and Hera was actually the third sister of Zeus.

Echo

Here’s our hero. Echo is a person’s name.

Echo didn’t have much contact with these gods. She likes to hunt in forests and deep mountains, and you can imagine a refined girl in animal skins. Because of this hobby, I met the real goddess Diana and often went hunting with her.

Teenage girls are full of energy, she is one of the chatterboxes. Be it a conversation or an argument, always finish last.

If anything, it’s like Mexico: too close to the Us. This mountain forest was the place where Zeus often played with his goddesses and was his love field.

One day Zeus came again. A jealous Hera was afraid that Zeus had done her any wrong, either by man or woman. She found the mountain, after all, women’s sixth sense is usually very accurate.

Zeus, of course, was frightened and fled, but they were gods and did not run faster than Hera.

Echo volunteered, and whenever Hera came looking for Zeus, she would use her eloquent rhetoric to hold Hera back so that Zeus could sneak away.

So many times, and nothing happened.

But it’s not always okay. At last, Hera discovered the truth. Hera, enraged, used her powers to punish Echo, and here are the rules.

Echo could only repeat the last words she heard forever. She could no longer hold forth with her beautiful voiceCopy the code

Zeus did not help her out of past affection. Poor Echo was left to wander the forest by himself.

She can howl like a Wolf, but only if the Wolf howls first.

She can sing the wind like a reed, but the reed must sing first.

In these days of suffering and loneliness, there was an urgent need for sustenance.

One day Echo found a beautiful young man named Narcissus hunting in the mountains.

She did something very wrong: she fell in love with him. If Zeus found him, he’d probably own him, too.

But she couldn’t say it, couldn’t ping, couldn’t pong. She can only ping, ping, ping, ping…

Here’s a classic scene from “Metamorphosis,” where Echo finally gets the courage to confront her, and she stalks him.

Narcissus: Who's here? Echo eagerly replied: Here.. Narcissus: Come here, please! Echo: Come here... Narcissus didn't see anyone coming: why are you hiding from me? Echo: Avoid me... Narcissus: Let's go together.. Echo: Together... Echo was overjoyed. Before she could say the next words, she ran up to Narcissus and hugged him. Men, it turns out, are also afraid of indecency. Narcissus backed away, screaming, "Let go! I'd rather die than let you have me! ' "Possession of me... "Echo could only answer.Copy the code

Narcissus decided Echo was a shameless woman and fled in terror.

Echo, however, could only hide in the depths of the forest with shame.

She began to live in caves and on cliffs.

Sorrow faded her face and her body.

When people laugh and talk, she can only bear loneliness in this cold and dark night.

Her bones were turned to rock, and only her voice echoed in the valley…

yet

The story of Narcissus follows.

Narcissus was a ruthless man. Because he rejected the advances of countless maidens, just as he rejected poor Echo.

Rejection also hurts. So one day a young girl prayed for Narcissus to experience what it was like to love without being loved.

Bored Nemesis offers a solution.

One day Narcissus came back from hunting, tired and thirsty. As he stooped to take water from a clear pool, he saw a beautiful figure.

It was his shadow. He insisted that it was a spirit living in the water.

He stood gazing with great admiration at his bright eyes, his beautiful ringlets of bacchus and Apollo, his round cheeks, his delicate neck, his parted lips, and the health and vitality that exhaled all over him.

He fell in love with himself.

He put his lips close to the water, trying to kiss himself. He put his hands in the water to embrace his beloved.

He never left his shadow for an instant. He spoke softly, hoping he could feel himself calling.

Eventually, he withered and died.

Narcissus means narcissism in English. It also means Narcissus. For when Narcissus died, he became a Narcissus.

End

This is the origin of echo’s command. Ever since I learned the story. Whenever you type the echo command on a shell, you feel overwhelmed.