Using the XP shell command line, how do I alter a specific environment variable without losing the original value. Please give example. Thanks
To alter a specific environment variable without losing the original value in the Windows XP shell command line, you can use the `setx` command. The `setx` command is available by default in Windows XP Service Pack 3 and later versions. Please note that modifying environment variables requires administrative privileges.
Here is an example of how to alter an environment variable while preserving its original value:
1. Open the command prompt by pressing Windows Key + R, then type `cmd` and press Enter.
2. Type the following command to view the current value of the environment variable:
```batch
echo %VARIABLE_NAME%
```
Replace `VARIABLE_NAME` with the name of the environment variable you want to modify.
3. To alter the variable's value while preserving the original value, use the `setx` command in the following format:
```batch
setx VARIABLE_NAME "%VARIABLE_VALUE%;%VARIABLE_NAME%"
```
Replace `VARIABLE_NAME` with the name of the environment variable you want to modify, and `VARIABLE_VALUE` with the new value you want to add or modify.
4. After running the command, you will receive a confirmation message.
For example, let's say you want to add "C:\NewFolder" to the existing `PATH` variable without losing its original value. You would use the following command:
```batch
setx PATH "C:\NewFolder;%PATH%"
```
Please note that changes made to environment variables via the `setx` command will only take effect in new command prompt windows. Existing command prompt windows will not reflect the changes until they are restarted.
Remember to exercise caution when modifying environment variables, as incorrect changes can cause issues with your system's functionality.