File System MODES
Where the following mode is supported:
- r: open an existing file for a read operation.
- w: open an existing file for a write operation. If the file already contains some data then it will be overridden but if the file is not present then it creates the file as well.
- a: open an existing file for append operation. It won’t override existing data.
- r+: To read and write data into the file. The previous data in the file will be overridden.
- w+: To write and read data. It will override existing data.
- a+: To append and read data from the file. It won’t override existing data.