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25) Republic Day 2021: Parade the right time security arrangements traffic prohibitions to Delhi Metro providers - All you need to know

India Republic Day -- Republic Day 2021 Parade Plan Chief Guest Security Arrangements: The parade normally considers thousands of people and foreign dignitaries invited to see the parade. Nevertheless the number of guests and participants has been restricted due to the coronavirus pandemic this time. Republic Moment 2021 Parade Timings Primary Guest Delhi Metro Services : India will celebrate its 72nd Republic Day in January 26. This day is definitely marked to celebrate the date on which the Constitution associated with India came into being in 1950. On this day the Republic Day parade takes place to show off the military might along with the rich cultural heritage in the country. The parade usually sees thousands of people and overseas dignitaries invited to see the celebration. However the number of guests as well as attendees has been restricted as a result of coronavirus pandemic this time. This season there will be no chief invitee or foreign dignitaries in Republic Day. The
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Command-line interface

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A command-line interface ( CLI ) processes commands to a computer program in the form of lines of text. The program which handles the interface is called a command-line interpreter or command-line processor . Operating systems implement a command-line interface in a shell for interactive access to operating system functions or services. Such access was primarily provided to users by computer terminals starting in the mid-1960s, and continued to be used throughout the 1970s and 1980s on VAX/VMS, Unix systems and personal computer systems including DOS, CP/M and Apple DOS. Today, many users rely upon graphical user interfaces and menu-driven interactions. However, some programming and maintenance tasks may not have a graphical user interface and may still use a command line. Alternatives to the command line interface include text-based user interface menus (for example, IBM AIX SMIT), keyboard shortcuts, and various desktop metaphors centered on the pointer (usually controlled with a
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Comparison to graphical user interfaces

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Compared with a graphical user interface, a command-line interface requires fewer system resources to implement. Since options to commands are given in a few characters in each command line, an experienced user may often find the options easier to access. Automation of repetitive tasks is simplified by line editing and history mechanisms for storing frequently used sequences; this may extend to a scripting language that can take parameters and variable options. A command-line history can be kept, allowing review or repetition of commands. A command-line system may require paper or online manuals for the user's reference, although often a "help" option provides a concise review of the options of a command. The command-line environment may not provide graphical enhancements such as different fonts or extended edit windows found in a GUI. It may be difficult for a new user to become familiar with all the commands and options available, compared with the icons and drop-down
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Types

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Operating system command-line interfaces edit Operating system (OS) command-line interfaces are usually distinct programs supplied with the operating system. A program that implements such a text interface is often called a command-line interpreter, command processor or shell. Examples of command-line interpreters include DEC's DIGITAL Command Language (DCL) in OpenVMS and RSX-11, the various Unix shells (sh, ksh, csh, tcsh, zsh, bash, etc.), CP/M's CCP, DOS' COMMAND.COM, as well as the OS/2 and the Windows CMD.EXE programs, the latter groups being based heavily on DEC's RSX-11 and RSTS CLIs. Under most operating systems, it is possible to replace the default shell program with alternatives; examples include 4DOS for DOS, 4OS2 for OS/2, and 4NT / Take Command for Windows. Although the term 'shell' is often used to describe a command-line interpreter, strictly speaking, a 'shell' can be any program that constitutes the user-interface, including fully gra
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History

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The command-line interface evolved from a form of dialog once conducted by humans over teleprinter (TTY) machines, in which human operators remotely exchanged information, usually one line of text at a time. Early computer systems often used teleprinter machines as the means of interaction with a human operator. The computer became one end of the human-to-human teleprinter model. So instead of a human communicating with another human over a teleprinter, a human communicated with a computer. The mechanical teleprinter was replaced by a "glass tty", a keyboard and screen emulating the teleprinter. "Smart" terminals permitted additional functions, such as cursor movement over the entire screen, or local editing of data on the terminal for transmission to the computer. As the microcomputer revolution replaced the traditional – minicomputer + terminals – time sharing architecture, hardware terminals were replaced by terminal emulators — PC software that interpreted termi
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Usage

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This section does not cite any sources . Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. ( April 2015 ) (Learn how and when to remove this template message) A CLI is used whenever a large vocabulary of commands or queries, coupled with a wide (or arbitrary) range of options, can be entered more rapidly as text than with a pure GUI. This is typically the case with operating system command shells. CLIs are also used by systems with insufficient resources to support a graphical user interface. Some computer language systems (such as Python, Forth, LISP, Rexx, and many dialects of BASIC) provide an interactive command-line mode to allow for rapid evaluation of code. CLIs are often used by programmers and system administrators, in engineering and scientific environments, and by technically advanced personal computer users. CLIs are also popular among people with visual disabilities since the commands and respons
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Anatomy of a shell CLI

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This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( July 2015 ) (Learn how and when to remove this template message) The general pattern of an OS command line interface is: Prompt command param1 param2 param3 … paramN Prompt — generated by the program to provide context for the client. Command — provided by the client. Commands are usually one of three classes: Internal commands are recognized and processed by the command line interpreter itself and not dependent upon any external executable file. Included commands run separate executable files generally considered part of the operating environment and always included with the OS. External commands run executable files that are not part of the basic OS, but added by other parties for specific purposes and applications. param1 …paramN — Optional parameters provided by the client. The format and
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