Hi all!

I have a data set in this tab separated format : Label, Value1, Value2

An instance is "data.txt" :
0 1 1
-1 2 3
0 2 2

I would like to parse this data set and generate two files, one that has only data with the label 0 and the other with label -1, so my outputs should be, for example :

data0.txt
0 1 1
0 2 2

and data-1.txt
-1 2 3

These are large datasets, and I do not know in advance how many labels there are. Assuming the labels are l1...ln, I would like the outputs stored in data_<label>.txt where <label> is one of l1...ln


Can someone here suggest a quick way to script / command-line this?

Thanks in advance!

awk '{file="data"$1".txt";print $0 > file}' data.txt