Types of DOS commands
The command generally means an
instruction written in computer language that user types to execute a specific
operation on the DOS prompt. The specific operations on the DOS prompt. The
command interpreter accepts our input in a specific form. This specification is
known as the syntax and the output is known as DOS command.
The two types of commands:-
1.
Internal commands
2.
External commands
Internal
Commands:-
Internal commands are those commands that are loaded
automatically in the memory when dos are loaded into memory during booting
process. These commands are easier to learn and use and require no eternal
files for their storage as in case of external commands. These commands are
always available at the console of the user and are executed must faster than
external commands. The internal commands are used for common jobs such as
copying, erasing and renaming files. Some common internal commands are copy, dir,
cd, copy con, time etc. In other words, those commands which are frequently
used and stored in the resident portion of the memory of the computer are
called internal commands.
External
Commands:-
The
external commands are used less frequently and are stored in some external
files which are in some secondary storage device. Whenever an external command
is to be executed the external file in which that particular command is stored
in transferred from the secondary storage i.e. disk to main memory i.e. RAM.
All
executable files with extensions .com, .exe, and .bat are the external
commands. These commands are used for relatively jobs like comparing two files,
formatting disk etc. For using external commands we need to use corresponding
command file available in DOS.
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