filter a data sheet for blank spaces
 

I have a datasheet with data organised in columns and seperated by tabs. I am trying to filter out only those rows where data are missing.

eg

1 2 3 4
5 7 8

that is I am trying to retrieve the second row but in vain. If the columns were seperated by spaces I could have use d the class name [[:space:]] with grep to get the result.. is there a related class name for tab? or is there another method than grep to obtain the desired result..

Try using sed. I have a book that I need to find and then will post mor information when I find it.

Deletes all blank lines