//**cat**// - concatenate and print files

Concatenate, or //cat//, is one of the most frequently used Linux and Unix-like system commands. It lists, combines, and writes file content to the standard output. To run the cat command, type cat followed by the file name. 

<code>$ cat filename.txt</code>

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1. To create a new file, type as listed below:

<code>$ cat > filename.txt</code>
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2. The following command will merge **filename1.txt** AND **filename2.txt** and will save the output in **filename3.txt**

<code>$ cat filename1.txt filename2.txt > filename3.txt</code>