It's a set of data analysis tools in command line.
_min
_max
_avg
_std
_sum
_div
_mult
Returns the min value of the data
_min < data.dat
cat data.dat | _min
Returns the max value of the data
_max < data.dat
cat data.dat | _max
Returns the average value of the data
_avg < data.dat
cat data.dat | _avg
Returns the standard deviation value of the data
_std < data.dat
cat data.dat | _std
Returns the sum of all the values in the data
_sum < data.dat
cat data.dat | _sum
Returns the values divided by a number
_div 2 < data.dat
cat data.dat | _div 2
Returns the values multiplied by a number
_mult 0.5 < data.dat
cat data.dat | _mult 0.5