matching 3 patterns in shell script

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1

IN a file I need to check for 3 patterns if all the 3 patterns are in the file. I need to send out an email. All this needs to be done in korn shell script. Please advise.

2

Very cheap, but:

if grep "PAT1" $FILE | grep "PAT2" | grep -q "PAT3"; then
  echo "found all 3 patterns"
fi