In multiple operating systems, how does one set the default Operating System?

In multiple operating systems, how does one set the default Operating System? -- Debian information of the Linux release-the following is a detailed description. In other operating environments (linux and windows2 systems)

If debian or other linux versions are installed, you should set them in linux. Without a doubt, we find that other non-windows systems cannot be seen in windows.

The setting is actually very simple. We use debian as an example.

1) First, go to the debian system and enter the Administrator account and password. Of course, you can have other users. However, you do not have the Administrator permission.

If you log on with another user, it doesn't matter. On the terminal, you can enter su. A prompt is displayed, indicating pwd and entering the administrator password. You also have administrator permissions.

2) if you say so much, you have to have the right to modify system files. All operating system files, including windows, are stored in a menu. in the lst file, the specific path is/boot/grub/menu. lst knows how to do it now .. directly enter the command gedit/boot/grub/menu. lst, you will find a lot of code:

# Default num
# Set the default entry to the entry number...
# The entry number 0 is the default if the command is not used.
#....
Default 0
# Timeout scc
Timeout 5
......

Haha, now it's clear... the original default settings of the system are 0 in order, 1...

The waiting time is also set here to see the timeout. You can set the waiting time in seconds.

Now you want to enable which system is used as the default, you only need to add the sequence number (0, 1 ..) after the default ..)

Save it and restart the system...