The document discusses directories, files, and commands in MS-DOS. It explains that directories and files are used to organize data, and that autoexec.bat and config.sys are configuration files that run commands automatically. It then discusses external commands like FORMAT, CHKDSK, and SCANDISK, as well as internal commands like COPY, DEL, DIR, and MD. Finally, it describes different types of files supported in MS-DOS like text files, batch files, and application files.

1. Directories and files, autoexec.bat,
config.sys
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2. Objective:
On completion of this period, you would be
able to know
External commands-FORMAT,
CHKDSK, SCANDISK etc
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3. Recap
In the previous class, you have learnt ….
What are internal commands?
Internal commands are built – in commands
Examples: COPY, DEL, DIR, TYPE, CD, MD,
RD, MODE, PATH, DATE, TIME, COPY CON
etc
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4. Prerequisite
What is meant by a command
An Instruction used to communicate with the
computer system
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5. File:
 File is a collection of text or data that are
logically related
 These are quite similar to the manual files that
we maintain to hold mails, memos etc
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6. MS-DOS supports the following files:
1. Text Files
These are the files used to store data
The data can be in the form of
characters, numbers and any other
symbols
These are the files used to store input
as well as output data of the programs
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7. MS-DOS supports the following files
2. Batch Files
These contain a set of instructions that are to
be executed as a Batch in a sequential order
3. Application Files
 These are usually application specific
 They are used to perform specific tasks
that will enable a user to do his job easily
 Word processors, calculators,
spreadsheets etc. are some application
program files
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