#! /bin/sh

while read a b c
do
  echo "a = $a, b = $b, c = $c"
  # if true
  # if test "$a" = "pie"
  if [ "$a" = "pie" ]
  then
    echo "got pie"; exit
  fi
done

# sample run:
# $ printf "1 2 3 4 5\nz yy xxx bb\npie 34 56\n" | bash y.sh
# a = 1, b = 2, c = 3 4 5
# a = z, b = yy, c = xxx bb
# a = pie, b = 34, c = 56
# got pie
# $