Average
Command-line calculator of basic statistics.
...It works as a traditional Unix filter and can be used as part of those greatly useful chains of piped commands.
It calculates average (arithmetic mean), standard deviation, median, total sum, minimum and maximum values present, and shows the number of processed numbers.
Entry can by a text file (any column can be specified, default is the first) or directly in the terminal if Average is run without specifying a file -- in which case, input can be terminated by pressing Ctrl-D.
It is possible to choose the output of a single statistic (just the value, no labels), instead of the fully detailed output (default).