free:tldr:cd445

The command "free -s ${2}" is used to display the amount of free and used memory in the system, with the option to specify the sampling interval.

Here's a breakdown of the different components:

• "free" is the command used to obtain memory related information in Linux systems.
• "-s" is an option flag that allows you to specify the sampling interval. This determines how often the memory usage statistics will be updated and displayed.
• "${2}" is a placeholder for the second command line argument passed to the script or command. It is likely a parameter that represents the desired sampling interval provided by the user.

In summary, this command will display memory usage statistics at a specified interval, as determined by the value provided as the second command line argument.