java run os command

running operating system commands from a java application can be achieved using the `processbuilder` or `runtime` classes. both of these classes provide a way to create operating system processes and communicate with them.

### using `processbuilder`

#### example of using `processbuilder`

here's a simple example that demonstrates how to use `processbuilder` to execute a command. in this example, we will run the `ls` command on a unix-like system or `dir` on windows to list directory contents.

### explanation of the code

4. **reading the command output**: we read the standard output of the command using a `bufferedreader`.

### important notes


- **security**: be cautious when executing commands that include user input to avoid command injection vulnerabilities.

- **platform independence**: if you want your application to be platform-independent, consider abstracting the commands an ...

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