datamash:tldr:6ae61

This command is a combination of two commands, "echo" and "datamash", piped together using the "|" symbol.

1. The "echo" command is used to print a string or series of strings to the standard output. In this case, the string being echoed is '1\n2\n3\n4\n5\n5'. The "\n" represents a newline character, so this string will print each number on a new line.

2. The output of the "echo" command is then piped (using the "|" symbol) to the "datamash" command.

3. The "datamash" command is a powerful command-line tool for performing mathematical operations on data. In this case, the "-R" flag is used to specify the number of decimal places wanted in the result.

4. The "${number_of_decimals_wanted}" is a placeholder for the actual number of decimal places you want to specify. You need to replace it with the desired number in the command.

5. The "mean 1" argument tells "datamash" to calculate the mean (average) of the numbers in the first column of input data.

So, the overall function of this command is to print the mean of the numbers '1', '2', '3', '4', '5', and '5' (all on separate lines) with a specified number of decimal places.