README.md

0x15. C - File I/O

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How to create, open, close, read and write files
What are file descriptors
What are the 3 standard file descriptors, what are their purpose and what are their POSIX names
How to use the I/O system calls open, close, read and write
What are and how to use the flags O_RDONLY, O_WRONLY, O_RDWR
What are file permissions, and how to set them when creating a file with the open system call
What is a system call
What is the difference between a function and a system call