ascii:tldr:2642c
This command uses the ascii function to convert the value of the variable ${a} into its ASCII representation.
The ascii function is commonly used in programming to convert characters into their corresponding ASCII values. ASCII (American Standard Code for Information Interchange) is a character encoding standard that assigns unique numerical values to represent characters and symbols.
In this specific command, the value of the variable ${a} is being passed as an argument to the ascii function. The ${a} could represent a character, a string, or a variable holding a character or string. The ascii function then converts the character(s) into their respective ASCII values.
For example, if the value of ${a} is "A", the command ascii ${a} would convert the character "A" into its ASCII value of 65.