Quantum Internet Benefits

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  The quantum internet is a network of quantum computers that are connected together using quantum communication. It has the potential to revolutionize many industries, including: Secure communications: The quantum internet would be inherently secure, as it would be impossible to eavesdrop on quantum communications without being detected. This could be used for applications such as secure financial transactions, government communications, and military applications. Quantum computing: The quantum internet would allow quantum computers to be connected together, which would allow them to solve problems that are currently impossible for classical computers. This could be used for applications such as drug discovery, financial modeling, artificial intelligence, and materials science. Quantum sensors: The quantum internet could be used to connect quantum sensors together, which would allow them to create a global network of sensors that could be used to monitor the environment, detect earthq

Head and Tail Commands in Linux


Head Command

Description : prints output of first part of the file by default it will print first 10 lines

Syntax : head filename

examples:

1.  head upcasting.java


it will print first 10 lines of the file upcasting.java by default.

2. head -n 50 upcasting.java
 it will print first 50 lines of the file upcasting.java.

3. head upcasting.java downcasting.java
it will print first 10 line of the 2 files upcasting.java and downcasting.java.

4. head *.java
it will print all the java files first 10 lines.

5. head *.java *.class
it will print all the java and class files first 10 lines.


Tail Command:

Description : prints output of last part of the file by default it will print last 10 lines

Syntax : tail filename

Examples:

1. tail upcasting.java
it will print last 10 lines of the file upcasting.java by default.

2. tail -n 50 upcasting.java
 it will print last 50 lines of the file upcasting.java.

3. tail upcasting.java downcasting.java
it will print last 10 line of the 2 files upcasting.java and downcasting.java.

4. tail *.java
it will print all the java files last 10 lines.

5. tail *.java *.class
it will print all the java and class files last 10 lines.

Practice Examples:

1. How to Print the 11th line of the file ?

    head -n 11 upcasting.java | tail -n 1

2. How to print lines from 5 to 11th of the file ?

    head -n 11 upcasting.java | tail -n 5

3.  How to print number of lines head and tail command file (by default it will  print 10 lines)?
   
    head upcasting.java | wc -l
    tail upcasting.java | wc -l


    both will return 10

    head -n 20 upcasting.java | wc -l
    tail -n 20 upcasting.java | wc -l


   both will return 20

   for number of word wc -w and number of characters wc -c

   head upcasting.java | wc -c
   it will print number of first 10 lines characters in digits

   tail upcasting.java | wc -c
   it will print number of last 10 lines characters in digits
 

   head upcasting.java | wc -w
   it will print number of first 10 lines words in digits

   tail upcasting.java | wc -w
   it will print number of last 10 lines words in digits

4. How to get First and last 5 files of java in a java directory?

   ls *.java | tail -n 5  
   ls *.java | head -n 5
 
   ls -l *.java | tail -n 5  
   ls -l *.java | head -n 5

5. ls -la *.class | tail -n 12 | wc -l  it will return 12

6.  ls -la *.class | tail -n 12
it will shows last 12 class files list

7.  ls -la *.class | head -n 12 
it will shows first 12 class files list.  

8.      head -c 10 downcasting.java
9.      tail -c 10 downcasting.java
10.   head -c 400  downcasting.java | tail -n 3

(updates still come)

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