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Viewing the contents of files
The Linux filesystem contains many directories and files. In the case of files, we need 
to learn how to read and manipulate them to round out our knowledge. We'll cover 
more topics surrounding file management in the next chapter. For now, we can 
benefit by taking a look at how to view the content of existing files.
We can print the contents of a file to the screen with the 
cat
 command, along with a 
filename as an argument. The following command, for example, can be used to view 
the contents of 
testfile.txt
 in our current working directory, which we created 
earlier in the chapter when we discussed the 
touch
 command. Sure, this exercise is 
rather pointless since that file is empty, but it offers a good first example:
cat testfile.txt

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Navigating and Essential Commands