java run shell command and get output

### overview

1. **processbuilder**: this class is used for creating operating system processes. it allows you to configure the process before starting it.
2. **inputstream**: to read the output of the executed command.
3. **errorstream**: to capture any error messages produced by the command.

### steps to execute shell commands in java

1. create a `processbuilder` instance with the command you want to execute.
2. start the process.
3. retrieve and read the output and error streams.
4. handle exceptions properly.

### example code

here’s a complete example that demonstrates how to run a shell command in java, capture its output, and handle any errors.

### breakdown of the code

1. **command specification**: the command (`ls -l` for unix/linux or `dir` for windows) is specified in the `command` variable.
2. **processbuilder setup**:
3. **process execution**: the `start()` method is called to run the command.
4. **output handling**:
- the standard output of the command is read using `inputstream` and appended to a `stringbuilder`.
5. **error handling**: similarly, the error output is read, and if any exists, it’s printed to the error stream.
6. **exit code**: the exit code of the process is checked to determine if the command was executed successfully.

### important notes

- always handle exceptions properly to avoid crashing the application.
- be cautious when executing shell commands, especially if you are incorporating user input, as this can lead to security vulnerabilities like command injection.
- ensure that the command you are trying to execu ...

#python commands cheat sheet
#python command prompt
#python command not found mac
#python command not found
#python commands pdf

python commands cheat sheet
python command prompt
python command not found mac
python command not found
python commands pdf
python command line
python command line args
python command line arguments parser
python command line arguments
python commands
python javascript
python javascript library
python javatpoint
python java
python java or c++
python javascript parser
python javadoc
python javalang