#!/bin/sh
         
FILE=/home/abigail/Words/enable.lst
PATTERNS="
abc
sch[ae]
.*a.*e.*i.*o.*u.*
^[[:xdigit:]]+$
(a|b)(c|d)(e|f)
"   

PROGRAMS=("/bin/grep -E" ./grepp)
OUTPUT=(/tmp/grep.out /tmp/grepp.out)
 
i=0
while [ $i -lt ${#PROGRAMS[*]} ]
do  echo -n ${PROGRAMS[$i]}
    time for pat in $PATTERNS
         do  ${PROGRAMS[$i]} $pat $FILE
         done > ${OUTPUT[$i]}
    i=$((i + 1))
done

i=1
while [ $i -lt ${#OUTPUT[*]} ]
do diff ${OUTPUT[0]} ${OUTPUT[$i]}
   i=$((i + 1))  
done

rm -f ${OUTPUT[*]}



/bin/grep -E
real    0m0.070s
user    0m0.060s
sys     0m0.010s
./grepp
real    0m2.774s
user    0m2.610s
sys     0m0.030s