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Docker is a set of platform as a service (PaaS) products that use OS-level virtualization to deliver software in packages called containers. [5] The service has both free and premium tiers. The software that hosts the containers is called Docker Engine. [6] It was first released in 2013 and is developed by Docker, Inc. [7]
A command-line interface (CLI) is a means of interacting with a computer program by inputting lines of text called command lines. Command-line interfaces emerged in the mid-1960s, on computer terminals, as an interactive and more user-friendly alternative to the non-interactive mode available with punched cards. [1]
The command displays the first screen of information from letter.txt, and then the following prompt appears: -- More—When the spacebar is pressed, the next screen of information will be displayed. It is also possible to clear the screen and remove all extra blank lines before displaying the file:
A visual example of a 24-satellite GPS constellation in motion with the Earth rotating. Notice how the number of satellites in view from a given point on the Earth's surface changes with time. The point in this example is in Golden, Colorado, USA ( 39°44′49″N 105°12′39″W / 39.7469°N 105.2108°W / 39.7469; -105.