How to find things under Linux.
Find files by filename
find . -type f -iname "*hello*"
Finds "Hello, hello, Thello, Thelloman, HELLO, hELLO, ..."
find . -type f -name "*Hello*"
Finds "Hello, THello, THelloman, ..."
Find files by content and filename
ack -i kmoretools
(Install with sudo zypper install ack)
Normally, one would use the standard tool grep, but ack is better in some ways: http://beyondgrep.com/