How to let all users print specified prompt information when logging in in Linux

In the Linux system, through configuration files and scripts, you can display the specified prompt information when all users log in. Next, we will introduce several commonly used implementation methods.

Method 1: Modify the /etc/issue file

Open the terminal and use a text editor (such as vi or nano) to edit the /etc/issue file with root permissions.

sudo vi /etc/issue

Add the prompt information you want to display at the end of the file, for example:

Welcome to My Linux System!
Please be aware that all activities are monitored.

Save and close the file.

Now, when the user logs in, the system will display the prompt information added in the /etc/issue file.

Method 2: Use the /etc/profile file

Open the terminal and use a text editor (such as vi or nano) to edit the /etc/profile file with root permissions.

sudo vi /etc/profile

Add the following code at the end of the file:

echo "Welcome to My Linux System!"
echo "Please be aware that all activities are monitored."

Save and close the file.

Now, when the user logs in, the system will execute the code added in the /etc/profile file and display the corresponding prompt information.

Method 3: Use /etc/update-motd.d/script

Open a terminal and use a text editor (such as vi or nano) to edit the /etc/update-motd.d/99-custom-message file with root permissions.

sudo vi /etc/update-motd.d/99-custom-message

Add the following code to the file:

#!/bin/sh
echo "Welcome to My Linux System!"
echo "Please be aware that all activities are monitored."

Save and close the file.

Grant execution permission to script:

sudo chmod +x /etc/update-motd.d/99-custom-message

Now, when the user logs in, the system will execute the /etc/update-motd.d/99-custom-message script and display the corresponding prompt information.

Method 4: Use the /etc/motd file

Open the terminal and use a text editor (such as vi or nano) to edit the /etc/motd file with root permissions.

sudo vi /etc/motd

Add the prompt information you want to display in the file, for example:

Welcome to My Linux System!
Please be aware that all activities are monitored.

Save and close the file.

Now, when the user logs in, the system will display the prompt information added in the /etc/motd file.

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