Flow control based on grep match pattern or string

Hi,

Looking to create a flow control based on a string or pattern matched in a log file.

The log file may contain either of these

1 CONFSUCCESS
2 CONFFAIL
3 CONFPARTIAL

Example:
cat System.log

dsfasdfasfas
adfsfasfa
safafaf sdfaasfsa CONFSUCCESS
adsfasdfadsfadsf fafasfasdfasdf fafasfafsa
sadfafasfasdfadss fdsafadff fasfadfaf asff

So idea is to grep the message from log, based on pattern run a flow control as below.

if

1 Look in System.log - CONFSUCCESS - show message as - SUCCESSFUL - Ask user to - Press ENTER to continue

if

2 Look in System.log - CONFFAIL - show message as - FAILURE - Exit (come out of shell)

if

3 Look in System.log - CONFPARTIAL - Show message as - PARTIALSUCCESS - Exit (come out of shell)

Thanks