Dharmendra_CLI_Drills_II

Dharmendra_CLI_Drills_II

Pipes---
1.Download the contents of "Harry Potter and the Goblet of fire" using the command line from here
  wget https://raw.githubusercontent.com/bobdeng/owlreader/master/ERead/assets/books/Harry%20Potter%20and%20the%20Goblet%20of%20Fire.txt
  
1. Print the first three lines in the book
    head -3 harry.txt

2.Print the last 10 lines in the book
    tail -10 harry.txt

3. How many times do the following words occur in the book? 
      => grep -o Harry Harray.txt | wc -l
      =>grep -o Ron Harry.txt  | wc -l
      =>grep -o Hermione Harry.txt | wc -l

4.Print lines from 100 through 200 in the book
   head -200 Harry.txt | tail -101

   
   
5. How many unique words are present in the book?
    tr ' ' '\n' < Harry.txt | sort|uniq|wc -l

 
 Processes, ports------
 1-List your browser's process ids (pid) and parent process ids(ppid)
    ps -o pid,ppid -e
  
 2-Stop the browser application from the command line
     killall -q firefox
     
 3- List the top 3 processes by CPU usage.
    ps -eo pid,ppid,%cpu  | head -n 4
    
 4- List the top 3 processes by memory usage.
   ps -eo pid,ppid,%mem | head -n 4

 5-Start a Python HTTP server on port 8000
    python -m SimpleHTTPServer 8000
  
 6- Open another tab. Stop the process you started in the previous step
     open another tab :- CTRL + ALT + T
     stop process:- sudo kill pid
 
 7-Start a Python HTTP server on port 90
    sudo python -m SimpleHTTPServer 90

 8- Display all active connections and the corresponding TCP / UDP ports.
       netstat -a 
   
 9- Find the pid of the process that is listening on port 5432
       start server:-  sudo python -m SimpleHTTPServer 5432
       find pid :-    pidof python
       stop server:- sudo kill pid
        
 Managing software------
 
 1- Install htop, vim and nginx
  sudo apt-get install htop
  sudo apt-get install vim
  sudo apt-get install nginx
 
 2- Uninstall nginx
   sudo apt-get purge nginx nginx-common


Misc----------
 
 1- What's your local IP address?
     curl ifconfig.me
      
 2- Find the IP address of google.com
      ping google.com
    
 3- How to check if Internet is working using CLI?
       sudo nm-online
       
 4- Where is the node command located? What about code?
    node command is located in :- nvm and npm
    npm install node
    nvm install node