CommandIt is called command yet reduced group of shock forces that specializes in raiding enemy territory. The concept is also used with reference to soldiers that make up this type of forces.

Commands, in this framework, are units dedicated to special operations taking place behind enemy lines. To develop their task, the members of the commands receive specialized training that allows them to face all kinds of situations of risk.

The missions of the commands may consist of intelligence activities (infiltrating or taking photographs, for example), hostage rescue, infrastructure control and sabotage.

Command or command, on the other hand, is the denomination they receive units command by a single high-ranking officer. The US military, to cite one case, divides its forces into several larger commandos.

“Command” (or “Commando”, in its original language) is the title of a film who starred Arnold schwarzenegger on 1985. The film, which was directed by Mark L. Lester, was a great success worldwide.

The idea of ​​command is also used in the realm of computing. In this case, command is a instruction that a person gives to a system for it to execute.

Depending on the environment, the way in which the user indicates the command to the computer system varies; for example, you may well do it when you need it, through the command line interface, or by making use of a function call as part of the code of a program. The command line (also known as command line interface) is a method by which people can instruct programs by entering a line of text.

At this point it is important to make a distinction between this and two other concepts that, despite having different meanings, are often used as synonyms:

* command interpreter: sometimes referred to as interpreter of orders or with the English term shell, is a computer program that gives the user an interface to access the services of the operating system. Depending on the case, the interpreter may be lines of text, graphic or natural language;

Command* console emulator: also called terminal emulator, is a program that allows simulating the operation of a computer terminal on various devices. Typically, its features include input / output redirection, process control, file reading and listing, and a scripting language for writing batch sequences.

The Username does not always instruct the system to execute a single command, but can instruct it to commission a series of commands, which may be included in a command file. scripts. This makes it possible to automate repetitive tasks that must be carried out throughout the day: it would be useless to require a person to write the same lines of text hundreds of times during their work shift, especially if there is no possibility that the computer make a mistake in this step.

One of the most interesting features of the commands is the ability to indicate input arguments or parameters to achieve a different behavior than the default. On operating systems TWO (a family used in personal computers originally designed for IBM computers, where it enjoyed great popularity), the arguments are usually indicated with a slash “/” followed by a letter, while in Unix (an operating system developed by AT&T in 1969), they are located after a single or double hyphen.

In the computers (computers) Macintosh, finally, Command is a combination key, similar to Ctrl on PCs.