| Typing a Command |
| Here we explains how to type a command at the command prompt and demonstrates the “Bad command or file name” message. |
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| • To type a command at the command prompt |
| 1. Type the following at the command prompt (we can type the command in either uppercase or lowercase letters): |
| nul |
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| If we make a typing mistake, press the BACKSPACE key to erase the mistake, and then try again. |
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| 2. Press ENTER |
| We must press ENTER after every command you type. |
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| The following message appears: |
| Bad command or file name |
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| The “Bad command or file name” message appears when you type something that MS-DOS does not recognize. Because nul is not a valid MS-DOS command, MS-DOS displays the “Bad command or file name” message. |
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| 3. Now, type the following command at the command prompt: |
| ver |
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| The following message appears on our screen: |
| MS-DOS version 6.22 |
| The ver command displays the version number of MS-DOS. |
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| Continue to the next section, where we will use the other command to view or manipulate the things. |