The error message gcc: command not found indicates that the GCC compiler is not installed on your system. To resolve this issue, you need to install GCC. The method of installation depends on the operating system you are using.

For a Debian or Ubuntu-based system, you can install GCC by running the following command:
sudo apt-get install build-essential

For a Fedora-based system, you can install GCC by running the following command:
sudo dnf install gcc

For a CentOS-based system, you can install GCC by running the following command:
sudo yum install gcc

For a Windows system, you can download and install MinGW or MinGW-w64, which provides a GCC compiler for Windows.

After installing GCC, try running the commands again to compile and run the "Hello World" program.
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