Crosh stands for Chrome Shell. It is a terminal emulator that provides a text-based interface for interacting with the underlying Linux-based operating system of a Chromebook. Unlike a full Linux distribution’s terminal, Crosh is a restricted environment designed primarily for system diagnostics, hardware testing, and network troubleshooting.
A new tab or dedicated window will appear with a black background and a white cursor, displaying the "crosh>" prompt. crosh window
Use Help: Type help or help_advanced at any time to see a list of available commands and their descriptions. Crosh stands for Chrome Shell
Is your Chromebook moving slower than molasses? Type: top crosh window
Most people close the Crosh window immediately because it looks like a computer from 1985. But here are three reasons to keep it open: