Importance of Operating System
1. It moderates the relationship between the computer and its peripherals 2. It helps in the management of files,- copying, deleting, moving of files from one storage location to the other. 3. It encourages the memory for its efficient usage and thus adding the speed of the computer. 4. It manages the activities of the processor in terms of job execution according to the priority of arrival ,of jobs 5. It informs the user of nay hardware or software error
6. It makes communication between the computer and the user or the operator possible. Data erasure/Erase
a method of software-based overwriting that completely destroys all electronic data. COPY
Internal - DOS 1.0 and above
Copies one or more files to another location.
COPY [/A | /B] source [/A | /B] [+ source [/A | /B] [+ ...]] [destination [/A | /B]] [/V] [/Y | /-Y]
source Specifies the file or files to be copied.
/A Indicates an ASCII text file.
/B Indicates a binary file.
destination Specifies the directory and/or filename for the new file(s). /V Verifies that new files are written correctly. /Y Suppresses prompting to confirm you want to overwrite an existing destination file.
/-Y Causes prompting to confirm you want to overwrite an existing destination file.
The switch /Y may be preset in the COPYCMD environment variable. To append files, specify a single file for destination, but multiple files for source (using wildcards or file1+file2+file3 format).
/Y and /-Y are only available in DOS 6 and above.
COPY originated as an internal command in 86-DOS
External - DOS 1.0 and above
Formats a disk for use with DOS.
FORMAT drive: [/V[:label]] [/Q] [/U]...