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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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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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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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