Understanding /dev/tty, /dev/tty0, and /dev/console in Linux

/dev/tty

ls -l tty
crw-rw-rw- 1 root tty 5, 0 May 8 09:32 tty

/dev/tty represents the controlling terminal of the current process. It dynamically points to the active console device (such as tty1, tty2, etc.), allowing the process to perform input and output on that terminal.

/dev/tty0

ls -l tty0
crw-rw-rw- 1 root tty 5, 0 May 8 09:32 tty0

/dev/tty0 is the virtual console device used by the graphical environment. When Linux boots, each virtual console receives a device file (tty1, tty2, …). /dev/tty0 refers to the primary graphical console; opening it switches to the newly opened virtual terminal.

/dev/console

ls -l console
crw------- 1 root root 5, 1 May 8 09:32 console

/dev/console is the system console used by the kernel during boot. All kernel output is sent to this device until the boot process finishes, after which it stops outputting. Boot‑time logs can be examined via /var/log/messages or the journalctl command.

In summary, /dev/tty points to the current active terminal, /dev/tty0 denotes the graphical virtual console, and /dev/console is primarily for kernel messages during system startup. While their functions differ, /dev/tty and /dev/tty0 are closely related as both represent console devices.