Grep

1. Multiline

See https://askubuntu.com/questions/27838/how-to-grep-2-or-3-lines-one-containing-the-text-i-want-and-the-others-just-be.

grep -Pzoir 'BIOS Mode:.*Legacy.*\n.*\n.*\n.*\n.*3\..' /home/Other/Inventory

find /home/Other/Inventory -iname 'SMRU*.log' -exec grep -Hi "OS Name:.*Windows" {} \; |
  grep -Eiv '_Deleted|_Donated|_Lab.old|_Obsolete|_Recycled|_VirtualBox|Windows Server'