1. Stat: Write your own version of the command line program stat, which simply calls
the stat() system call on a given file or directory. Print out file size, number of blocks
allocated, reference (link) count, file permissions, and file inode.
Useful interfaces: stat()
2. List Files: Write a program that lists files in the given directory. When called without
any arguments, the program should just print the file names. When invoked with the -l
flag, the program should print out information about each file, such as the owner, group,
permissions, and other information obtained from the stat() system call. The program
should take one additional argument, which is the directory to read, e.g., myls -l
directory. If no directory is given, the program should just use the current working
directory.
Useful interfaces: stat(), opendir(), readdir(), getcwd().
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3. Tail: Write a program that prints out the last few lines of a file. The program should be
efficient, in that it seeks to near the end of the file, reads in a block of data, and then goes
backwards until it finds the requested number of lines; at this point, it should print out
those lines from beginning to the end of the file. To invoke the program, one should type:
mytail -n file, where n is the number of lines at the end of the file to print.
Useful interfaces: stat(), lseek(), open(), read(), close().
4. Recursive Search: Write a program that prints out the names of each file and directory
in the file system tree, starting at a given point in the tree. For example, when run without
arguments, the program should start with the current working directory and print its
contents, as well as the contents of any sub-directories, etc., until the entire tree, root at
the CWD, is printed. If given a single argument (of a directory name), use that as the root
of the tree instead.
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