What if I disable the Linux operating system illegally?

What will happen if you disable the Linux operating system illegally? Linux general technology-Linux technology and application information. The following is a detailed description. Have you ever tried to shut down the Linux operating system illegally? What will happen to it? I once ran out to save time and pressed the power switch directly. The next day, I went into normal operation. Once, there was no electricity, it's okay. I also pressed the host to close it the day before yesterday. This time something really went wrong. After the detection, it wasn't the login interface, but the strange black and the inexplicable English, and it was no longer difficult to fix it, I will reinstall it. As a result, I found a problem, that is, it was okay to shut down the program for the first two times and shut down the system directly. The problem was that the running program was included this time, but there was a major problem.