It is important to understand file pathnames since you need to '''save or access a file without ambiguity''' because there may be several files by that name in various directories. For example: Accessing the '''cars.txt''' file - which file to access? It depends on the location of the file

For example:Accessing the '''cars.txt''' file - which file to access? It depends on the location of the file <span style="color:blue;font-weight:bold;font-family:courier;">/home/userid/uli101/cars.txt</span>:<span style="color:blue;font-weight:bold;font-family:courier;">/public/uli101/samples/cars.txt</span>:<span style="color:blue;font-weight:bold;font-family:courier;">/etc/data/cars.txt</span>