Here's a useful video on the topic:

By default, it displays the first lines when used in the following form:

head [filename]
head -n 11 [filename]  -> First 11 lines  
head -c 20 [filename]  -> First 20 characters  

Since we will provide the text files via STDIN, the filename may be ignored.

We can also specify a certain number of lines to be displayed and list multiple filenames as well. It may also be used to display a specified number of bytes from an input file. Click here for more details about using the head command.

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