The cat (Felis catus) is a domestic species of a small carnivorous mammal.
And is also a standard Unix utility, yay!
Cat is used to read files sequentially, writing them to standard output.
Open your terminal; use touch to create a file:
$ touch file
$ echo "Hello World" >> file
Prints "Hello world"
$ cat file
Copy the file contents:
$ touch file2
$ cat file >> file2
Prints "Hello world"
$ cat file2
Concatenate multiple files:
$ touch file3
$ cat file file2 >> file3
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