Files

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• The Files and documents can of different type and this type is called extensions in computer terms.

• Always remember, whatever you will type in CMD, it will be case-sensitive.

Example:-

1. javac a.java
2. javac A.java

Both are different.

• A document with a .doc, .xls, or .ppt extension :- Is a Word, Excel, or Powerpoint document

• A file with a .exe, or a .dll extension :- Is an Executable or a Dynamic Link Library file

• A file with a .dat extension :- Is typically some form of data file

• A file with a .txt extension :- Is typically some form of text file

• A file with a .zip extension :- Is typically some form of compressed file

• Now in order to give instructions to computer the user gives Commands.

• They are as follows:-

1. CLS:-To clear up the screen
2. HELP:- List help for all commands
3. HELP[cmd]:- List help for given command

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