Samy Samy - 11 months ago 51
Bash Question

Shell script: grep a table of values from a file

I have a result file that looks like this:

data data data data data...
data data data data data...
data data data data data...

#0
data data is 2

#1
data data is 2

testing data ( )

n m
256 729.44
352 1555.07
448 2649.68

#2
data data is 2

#3
data data is 2


I need to grep only the table that will always have 2 columns of n and m(it can get very long). So the output should be:

n m
256 729.44
352 1555.07
448 2649.68


I've tried using awk and grep but I can only get one line not the whole table. Any help would be appreciated it.

Answer Source

Using AWK you would print all lines where the Number of Fields equals to 2:

awk 'NF == 2' data.txt