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Thanx, it works! I've been using ksh and csh, and it seems like using grep with '\t' doesn't really work in those, but it worked perfectly when I changed to bash :)

Lol for the next generation who are going to search for the truth.

You can try to type $ grep '^[(space)(tab)+].*[(space)(tab)+]$' filename
That will take care of any line that has one OR more space (AND/OR tab) at the beginning AND has one OR more space (AND/OR...