It is called command a small group of shock troops specializing in venture into enemy territory. The concept is also used with reference to soldiers who are part of this type of force.
The commandos, in this framework, are units dedicated to special operations that are carried out behind enemy lines. In order to carry out their task, the members of the commands receive specialized training that allows them to face all kinds of risk situations.
The missions of the commands may include intelligence activities (infiltrating or taking photographs, for example), hostage rescue, control infrastructure and sabotage.
Command, on the other hand, is the name given to combat units by a single high-ranking officer. The US military, to cite one case, divides its forces into several larger commandos.
“Comando” (or “Commando”, in its original language) is the title of a movie that Arnold Schwarzenegger starredin 1985. The film, which was directed by Mark L. Lester, was a huge success worldwide.
The idea of command is also used in the field of computing. In this case, command is an instruction that a person gives to a system so that it executes it.
Depending on the environment, the way in which the user indicates the command to the computer system varies; for example, you can either do it when you need it, through the command line interface, or by using a function call as part of program code. The command line (also known as the 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 called command interpreter or with the English term shell, it is a computer program that gives the user an interface to access the services of the operating system. Depending on the case, the interpreter can be lines of text, graphic or natural language;
* Console emulator: also called terminal emulator, it is a program that allows simulating the operation of a computer terminal on various devices. Typically features include input / output redirection, process control, file reading and listing, and a scripting language for batch script writing.
The user does not always order the system to execute a single command, but can instruct it to commission a series of commands, which can be included in a script file. This allows 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 possibility of indicating input arguments or parameters to achieve a different behavior from the default. In DOS operating systems (a family used in personal computers originally designed for IBM computers, where it was very popular), arguments are usually indicated by a slash “/” followed by a letter, while in Unix (an operating system developed by AT&T in 1969), are located after a single or double hyphen.
In computers (PCs) Macintosh finally Command is a key combination like Ctrl in PCs.