To display a large colorful text banner on the screen in a Unix or Linux system, you can use the figlet command. The figlet command is a tool for creating large ASCII art text banners from plain text.
To install figlet, you can use your system's package manager. For example, on a Debian-based system such as Ubuntu, you can use the apt command to install figlet:
sudo apt install figlet
On a Red Hat-based system such as CentOS, you can use the yum command to install figlet:
sudo yum install figlet
Once figlet is installed, you can use it to display a text banner by specifying the text as an argument. For example, to display the text "Hello, world!" as a banner, you can use the following command:
figlet "Hello, world!"
This will display a banner with the text "Hello, world!" in large ASCII art letters.
You can customize the appearance of the banner by using options such as -f to specify a different font, -w to specify the width of the banner, and -c to specify the color of the banner. For example, to display the text "Hello, world!" in red using the cyberlarge font and a width of 100 characters, you can use the following command:
figlet -f cyberlarge -w 100 -c red "Hello, world!"
You can use the -l option to list the available fonts, and the -h option to display the help message with a list of all available options.
You can use the figlet command in combination with other tools.