import jcifs.internal.util.SMBUtil;

/**
 * SMB2 Read request message.
 *
 * This command is used to read data from a file that has been
 * previously opened with a Create request.
 *
 * @author mbechler
 */
public class Smb2ReadRequest extends ServerMessageBlock2Request<Smb2ReadResponse> implements RequestWithFileId {

    /**
     * Flag to indicate unbuffered read operation
     */

* `write(data)`: Writes `data` (`str` or `bytes`) to the file.
* `read(size)`: Reads `size` (`int`) bytes/characters of the file.
* `seek(offset)`: Goes to the byte position `offset` (`int`) in the file.
    * E.g., `await myfile.seek(0)` would go to the start of the file.
    * This is especially useful if you run `await myfile.read()` once and then need to read the contents again.
* `close()`: Closes the file.

// Use it with other programs, like
$ echo "Hello $Env:MY_NAME"

Hello Wade Wilson
```

</div>

////

## Read env vars in Python { #read-env-vars-in-python }

You could also create environment variables **outside** of Python, in the terminal (or with any other method), and then **read them in Python**.

For example you could have a file `main.py` with:

```Python hl_lines="3"
import os

        }
        bufferIndex += 4;

        // Read signature
        System.arraycopy(buffer, bufferIndex, header.signature, 0, 16);
        bufferIndex += 16;

        // Read nonce
        System.arraycopy(buffer, bufferIndex, header.nonce, 0, 16);
        bufferIndex += 16;

        // Read original message size
        header.originalMessageSize = SMBUtil.readInt4(buffer, bufferIndex);

                int read = socketChannel.read(tempBuffer);
                if (read < 0) {
                    break;
                }
                totalRead += read;
            }

            tempBuffer.flip();
            buffer.put(tempBuffer);

            log.debug("TCP RDMA read completed: {} bytes", totalRead);
            return totalRead;

			t.Fatalf("Impossible read specified: %d %d %d", skipLen, readLen, oSize)
		}

		var cumulativeSum, cumulativeEncSum int64
		toRead := readLen
		readStart := false
		for i, v := range s {
			partOffset := int64(0)
			partDarePkgOffset := int64(0)
			if !readStart && cumulativeSum+v > skipLen {
				// Read starts at the current part
				readStart = true

                core.setOutput('sys-prop-args', '-DagreePublicBuildScanTermOfService=yes -Ddevelocity.edge.discovery=false -DcacheNode=us --scan')
            } else {
                core.setOutput('sys-prop-args', '')
            }
      - name: Setup Gradle
        uses: gradle/actions/setup-gradle@v4
        with:
          cache-read-only: ${{ github.ref != 'refs/heads/master' }}

     * Optimized for better performance with larger read sizes and reduced round trips.
     *
     * @param b the buffer to read into
     * @param off the offset in the buffer to start writing
     * @param len the maximum number of bytes to read
     * @return number of bytes read
     *
     * @throws IOException
     *             if a network error occurs
     */

    }

    /**
     * Read data from RDMA connection
     *
     * @param buffer buffer to read data into
     * @param remoteAddress remote memory address for RDMA read
     * @param remoteKey remote memory key
     * @param length number of bytes to read
     * @return number of bytes actually read
     * @throws IOException if read operation fails
     */

To ensure that you don't return more data than you should, read the docs for [Tutorial - Response Model - Return Type](../tutorial/response-model.md){.internal-link target=_blank}.

## Documentation Tags - OpenAPI { #documentation-tags-openapi }