# How to Merge PDF Files on Command Line

Recently, I needed to combine 2 or more PDF files into one.
Merging these PDF files could be due to the company's demand or a need to track all files in one file.
In this tutorial, I'd show you how I accomplished this particular task on my machine.
There are several tools online to merge pdf files but I will use `pdfunite`.

## **Installation**

To install pdfunite on your machine, follow the steps below.

### **CentOS/Fedora/RHEL**

First, we'll install the **poppler** package.

```CMD
sudo yum -y install poppler
```

Next, we update the system

```CMD
sudo yum update
```

### **Ubuntu/Debian**

The Ubuntu/Debian OS follows the same installation procedures as CentOS but with a different package name.  

```CMD
sudo apt install poppler-utils
```

Then, we updated the system using

```CMD
sudo apt update
```

### **MacOS**

On macOS, you can use Bash and execute the Linux commands or you can choose to use the brew package manager.

```CMD
brew install poppler
```

### **Windows**

Using the chocolatey command-line tool on Windows, execute the following command:
```CMD
choco install poppler
```

## **Usage**

```Bash
.
├── 1300.pdf
├── 1500.pdf
├── 1750.pdf
├── 1980.pdf
└── 1990.pdf
```

I assume we have all the pdf files in a folder to form the above file structure.
To merge these, execute this command on the terminal

```Bash
pdfunite 1300.pdf 1500.pdf 1750.pdf 1980.pdf 1990.pdf output.pdf
```
The last file `output.pdf` is the merged pdf. Hence, the last parameter to pass is the output of all merges.


## **Conclusion**

In this short tutorial, we've seen how to merge several using the command line on our machines.