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m4 is a general-purpose macro processor included in most Unix-like operating systems, and is a component of the POSIX standard.. The language was designed by Brian Kernighan and Dennis Ritchie for the original versions of UNIX.
SYS is also a command in Microsoft BASIC used to execute a machine language program in memory. The command took the form SYS n where n is a memory location where the executable code starts. Home computer platforms typically publicised dozens of entry points to built-in routines (such as Commodore's KERNAL [ 10 ] ) that were used by programmers ...
Some commands are internal—built into COMMAND.COM; others are external commands stored on disk. When the user types a line of text at the operating system command prompt, COMMAND.COM will parse the line and attempt to match a command name to a built-in command or to the name of an executable program file or batch file on disk. If no match is ...
Text-based menu in an application program Text-based menu (German) with selection by cursor keys or mouse. A computer using a command line interface may present a list of relevant commands with assigned short-cuts (digits, numbers or characters) on the screen.
The configuration of a computer is typically recorded in a configuration file. In modern computer systems, this is created and updated automatically as physical components are added or removed. Applications may assume that the configuration file is an accurate representation of the physical configuration and act accordingly.
In computing, a command is a directive to a computer program to perform a specific task. It may be issued via a command-line interface or as input to a network service as part of a network protocol, or as an event triggered in a graphical user interface. Specifically, the term command is used in imperative programming languages.
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The instructions are usually part of an executable program, often stored as a computer file and executed on the processor. The x86 instruction set has been extended several times, introducing wider registers and datatypes as well as new functionality.