[ ~/tmp ] $ perl data_read
1_0 = qwerty
1_1 = qwerty
1_2 = qwerty
1_3 = asdf
1_4 = zxcv
1_5 = 1234
2_0 = qwerty
2_1 = qwerty
2_2 = qwerty
2_3 = asdf
2_4 = zxcv
[ ~/tmp ] $