Input is the term denoting either an entrance or changes which are inserted into a system and which activate/modify a process. It is an abstract concept, used in the modeling, system(s) design and system(s) exploitation. It is usually connected with other terms, e.g., input field, input variable, input parameter, input value, input signal, input port, input device and input file (file format).

Input may refer to:

• Advice (opinion), an opinion or recommendation offered as a guide to action, conduct.
• Information, any data entered into a computer or data processing system, see input output
• The act of entering data into a computer or data processing system (see Input/output).
• Input device, any peripheral (piece of computer hardware equipment) used to provide data and control signals to an information processing system (such as a computer)
• Stimulus (physiology), a detectable change in the environment that influences an activity of an organism
• Power consumption, an amount of power used by a system.
• International Public Television Screening Conference, an international public television organization
• In economics, a factor of production, a resource employed to produce goods and services.

Computer program (also a software program, or just a program) is a sequence of instructions written to perform a specified task for a computer.A computer requires programs to function, typically executing the program's instructions in a central processor.The program has an executable form that the computer can use directly to execute the instructions. The same program in its human-readable source code form, from which executable programs are derived (e.g., compiled), enables a programmer to study and develop its algorithms.

Command is a directive to a computer program acting as an interpreter of some kind, in order to perform a specific task. Most commonly a command is a directive to some kind of command line interface, such as a shell.

Specifically, the term command is used in imperative computer languages. These languages are called this, because statements in these languages are usually written in a manner similar to the imperative mood used in many natural languages. If one views a statement in an imperative language as being like a sentence in a natural language, then a command is generally like a verb in such a language.

Many programs allow specially formatted arguments, known as flags, which modify the default behaviour of the command, while further arguments describe what the command acts on. Comparing to a natural language: the flags are adverbs, whilst the other arguments are objects.

 
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