FTP, cURL and Linux Intro

-
FTP, cURL and Linux Intro

FTP(FIle Transfer Protocol)

The FTP protocol consists of two connections
  1. Control connection
  2. Data Connection

The control connection is run on port 23 and it authorizers and authenticates the client and the server
after both the client and server are authenticated,
The data ia sent over port 21 on the data connection

After the file is uploaded or any other file operation is performed the data connection is closed After the data connection is closed, the control connection is closecd
CURL
CURL stands for Connect URL (Uniform Resource Locator).It is used my most Operations now-a-dayssince it s simplicity, reliabily and multitasking. The few operating systems which have support of installing CURL are Windows 10, Windows11 ,Linux,etc. Let us take an example to see how CURL works
Steps: 
        
$x=curl_init();// Creates a CURL object with initialization parameters
curl_open($x,http://thewebdesk,.blogspot.com"); // //Opens a connection to the server
curl_set_opts();//configuraion and initializing options fo the HTTP request and response
curl_return_transfer = true; ("To return the updated web page or of it is text, output the server's response on the client's console
curl_close(); //closes the CURL session

To put multiple files in the file server, use

wput server_URL

To download multiple files from the file server in:

wget server_URL

To find the intermediate routers in the path from the client to the server, use

traceroute command

Usage is - traceroute "http://thewebdesk.blogspot.com"

To get the statistics of the network use the

netstat command

It will show all active connections for the server including the following information:-
  • port_number
  • ip_address
  • domain_name
  • protocol_name
  • ipv6_address
  • The number of intermediate routersand their ipv4 addresses,

Some Linux OS Basics:

  • df:- returns the disk memory which is free
  • du:-Returns the disk cmemory which is currently in use
  • ls:- returns the list of fikles in the current dierectory
  • ls -a:-Returns the list of file sin the current directory incliuding incliudong hidden files
The hidden files are prefixed the . symbol

Installing and upgrading softwares in Linux To install a software, use the sudo apt-get install <package_name>
Here,sudo will make this command to run with suepruser privileges and will ask for the superuser's username and password.
If the username and password are true,it will download the package names into "" from the "apt" repository
sudo apt-get update This conmand will update all the packages installed from the apt repository to their latest versions


Miscellaneous Points:
  • The "." represents the path of the current file or directory
  • The ".." represent sthe path of the parent directory
  • The root directory in a LInux OS is /
  • IT contaoins the followingf subdierectories:
  • /, /root, /bin, /sbin, /usr, /var, /tmp, /spool, /etc

    • Comments

    Post a Comment

    Popular posts from this blog

    XPath for HTML markup

    -
    XPath Web Scraping Web Scraping is a technique to traverse the DOM (Document Object Model) of an HTML or an HTTP web page Web Scraping is achieved due to XPath XPath nodes: There are seven kinds of nodes Element - It represents any HTML 5 element. For example, <strong></strong> Attribute - It represents any one attribute of any HTML 5 element in the document object model Text - It represents the text between the opening HTML 5 tag and a closing HTML 5 tag Namespace - It represents the pseudo selector of an HTML 5 element Processing-Instructions Comment - It represents any HTML 5 comment It represents the topmost element of the tree is called the root element. For example, the root element for any HTNL 5 document is HTML The first XPath node is \ which Suppose, I have an HTML5 code snippet as follows: Gaurav Shirodkar Then to ...
    Read more

    Apache Hadoop | Running MapReduce Jobs

    -
    Image
    Apache Hadoop | Running MapReduce Jobs After setting up your environment and running the HDFS and YARN daemons, we can start working on running MapReduce jobs on our local machine. We need to compile our code, produce a JAR file, move our inputs, and run a MapReduce job on Hadoop. Step 1 - Configure extra environment variables As a preface, it is best to setup some extra environment variables to make running jobs from the CLI quicker and easier. You can name these environment variables anything you want, but we will name them HADOOP_CP and HDFS_LOC to not potentially conlict with other environment variables. Open the Start Menu and type in 'environment' and press enter. A new window with System Properties should open up. Click the Environment Variables button near the bottom right. HADOOP_CP environment variable This is used to compile your Java files. The backticks (eg. `some command here`) do not work on Win...
    Read more

    Laravel | PHP | Basics | Part 2

    -
    Image
    Learning Laravel through Screenshots Caching Laravel by default supports multiple cache stores like memcached , redis ,etc. To install redis as a cache store, you should use composer install predis/predis predis stands for PHP redis The default port number is 6379 Every Cache store requires a prefix which is stored in the ENV file or in the config/cache.php Following are the cache stores supported by laravel Blade Templates Blade is a templating engine for views in laravel. All the files which are of type blade.php are having the extension .blade.php They are stored in the resources/views directory YOu can create suub-folders in the reosurces/views directory like layouts for all the common UI components lke header , footer, sidebar , navbar, menubar, serach bar, etc. To include the parenet ...
    Read more