Additive color mixing begins with black and ends with white; as more color is added, the result is lighter and tends to white. The RGB colors are light primaries and colors are created with light. Percentages of red, green, & blue light are used to generate color on a computer screen.
In shell scripting we often need to check if file or directory exists and take appropriate action. This post show you how to check it and how this check use in your script. For checking we will use file test operators -f for file and -d for directory, which return TRUE if file or directory exists. And here is output of the script.
in BASH Shell, Linux, UNIX. How do I get the current server time in shell script on Linux or Unix-like operating systems? How do I store the current time in the shell variable and use in my scripts? You can use the date command to display or set the current date and time. You need to use the date FORMAT syntax to controls the output of the date command.