Everything You Need to Know About the cat Command and Tips to Use it Effectively
Tags: beginners, linux, bash
Published: 2023-01-21 15:06:55

---

### **_Introduction_**

The `cat` command is one of the most basic and widely used commands in Linux. It stands for concatenate, and it allows you to view the contents of one or more files on the command line. In this blog post, we'll explore some of the key features of the `cat` command and provide examples and tips to help you use it more effectively.

### **_Viewing the contents of a single file_**

The most basic usage of the `cat` command is to simply view the contents of a file. For example, if you want to view the contents of a file called "file.txt", you would enter the following command:

```
cat file.txt
```

![Output](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/h2jbgm5bn6gf3t5q2795.png)

This will display the contents of the file on the screen.

### **_Viewing the contents of multiple files_**

You can also use the `cat` command to view the contents of multiple files at once. For example, if you want to view the contents of "file1.txt" and "file2.txt," you would enter the following command:

```
cat file1.txt file2.txt
```

![Output](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/g3hy7otwkzi56wvoo2pj.png)

### **_Concatenating the contents of multiple files_**

Another useful feature of the `cat` command is its ability to concatenate (or join) the contents of multiple files together. This can be useful when you need to combine several files into a single document. For example, if you want to concatenate the contents of "file1.txt" and "file2.txt" into a new file called "file3.txt," you would enter the following command:

```
cat file1.txt file2.txt > file3.txt
```

![Output](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/rr1edrkcwq40cwpnugax.png)


This will create a new file called "file3.txt" that contains the contents of both "file1.txt" and "file2.txt."

### **_Customizing the cat command with options_**

The `cat` command also has several options that can be used to customize its behavior. For example, the `-n` option can be used to display line numbers when viewing the contents of a file. For example, if you want to view the contents of "file.txt" with line numbers, you would enter the following command:

```
cat -n file.txt
```

![Output](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/i625hpmt43sh8mt836jb.png)


### **_Tips for using the cat command_**

Here are some tips to keep in mind when using the `cat` command:

- You can use the `cat` command with the `-T` option to display tabs in a file:

```
cat -T file1.txt
```

![Output](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/4a6uji4s3b6vuc0bwdw4.png)


- Use the `-E` option to display the end-of-line character:

```
cat -E file1.txt
```

![Output](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/qd4fq2qeictqxjlw5l6m.png)

- Use the `cat` command with the `-A` option to display non-printable characters:

```
cat -A file1.txt
```

![Output](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/gy12d0mrlqhfu66d6859.png)

- To create a new file, you can use `cat > filename.txt << EOF` and then add the content:

```
cat > filename.txt << EOF
```

![Output](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/iw19rjuwkmdcnqlhrzgf.png)

### **_Conclusion_**

In conclusion, the `cat` command is a powerful and versatile tool that can be used to view, concatenate, and manipulate the contents of files in Linux. By understanding the different options and features of the `cat` command, you can use it more effectively to manage your files and automate your workflow.


**_Thank you for reading_** 🧑‍💻
**_Stay tuned for more_** 🚀

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