There are a few different ways to run a command on startup in Linux, depending on your distribution and the specific needs of your command. Here are a few options:

1. Add the command to the system-wide startup script: 
    - On Ubuntu and other Debian-based distributions, you can add your command to the /etc/rc.local file, which will run the command as root on startup. 
    - On CentOS and other Red Hat-based distributions, you can add your command to the /etc/rc.d/rc.local file, which will run the command as root on startup. 

2. Use the systemd service manager: 
    - Create a new systemd service file in the /etc/systemd/system directory using your favorite text editor. 
    - Here is an example of a simple systemd service file that runs a command on startup:
        ```
        [Unit]
        Description=My Startup Command

        [Service]
        Type=simple
        ExecStart=/path/to/my/command

        [Install]
        WantedBy=multi-user.target
        ```
    - Save the file and run the following commands to start the service and enable it to run on startup:
        ```
        sudo systemctl start mycommand.service
        sudo systemctl enable mycommand.service
        ```

3. Add the command to your user's .bashrc file: 
    - This method is best if you only need the command to run when you log in to your user account, rather than system-wide. 
    - Open your user's .bashrc file in your favorite text editor and add the command to the end of the file. 
    - Save the file and exit the editor. 
    - The command will now run every time you log in to your user account.
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