20. Create a linux bash script to get a filename as input and then it should check and display if file exist and size is greater than zero, then should get input of any file comparison operator and then display if the file is true or false for that given file comparison operator. 21. Create a linux bash script to get three numbers as positional parameters then display the greatest and least of the given numbers. If positional parameters are not given then message "This script requires 3 numbers as positional parameters, Try again.." should be displayed.

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