Chapter 3 - Working with Files.write.c  -  A simple program that uses write.read.c  -  A simple program that uses read and write.system.c  - A program that uses low-level system calls to copy one file to another.block.c  -  An improved version of system.c that copies blocks of data between the files.stdio.c  -  A program uses library calls to further improve the speed of the above programs by bufferingthe file input and output.print1.c  -  A program that prints out the contents of the home directory.print2.c  -  An improved version of print1.c that takes the directory as an argument.mmap.c  - A program that maps a file into memory as an array and then alters its contents.  (Needs Linux 2.0.)