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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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Most command-line interpreters support scripting, to various extents. (They are, after all, interpreters of an interpreted programming language, albeit in many cases the language is unique to the particular command-line interpreter.) They will interpret scripts (variously termed shell scripts or batch files) written in the language that they interpret. Some command-line interpreters also incorporate the interpreter engines of other languages, such as REXX, in addition to their own, allowing the executing of scripts, in those languages, directly within the command-line interpreter itself. Conversely, scripting programming languages, in particular those with an eval function (such as REXX, Perl, Python, Ruby or Jython), can be used to implement command-line interpreters and filters. For a few operating systems, most notably DOS, such a command interpreter provides a more flexible command-line interface than the one supplied. In other cases, such a command interpreter can present a highly...
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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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