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Path to a File
Every directory always contains two special files:
.- Current directory
..- Parent directory (of the current directory).
Absolute Path to a File
/home/user/directory/file.txt
Relative Path to a File
Relative to the current directory.
./directory/file.txt is the same as
directory/file.txt or
../user/directory/file.txt when the current directory is
/home/user/.
