Странно работает скрипт поиска

echo "Directories"
read a
echo "Masks"
read b
echo "Phrase"
read c
echo "File"
read d
for DIR in $a/*
do
for MASK in $b
do
find $DIR -name $MASK | xargs grep -li "$c" | sort >> $d
done
done
echo "Read file?"
until false
do
read x
case $x in
y|Y) cat $d; break;;
n|N) echo OK; break;;
*) echo Problems
esac
done

grep -ilr "$c" $(sed 's/\S\+/--include="&"/g' <<<$b) $a | sort >> "$d"

sed 's/\S\+/--include="&"/g' <<<$b | xargs grep -ilr "$c" $a | sort >> "$d"

find $DIR -name *.txt *.doc | xargs grep -li "$c" | sort >> $d

man find | sed -n '/NON-BUGS/,/BUGS/p'

21:10( IFS=$IFS_DEFAULT)
->read b
1 2 3
21:10( read b)
->echo $b
1 2 3
21:10( echo $b)
->sed 's/\S\+/--include="&"/g' <<<$b
--include="1" --include="2" --include="3"
21:10( sed 's/\S\+/--include="&"/g' <<<$b)
->echo $b | sed 's/\S\+/--include="&"/g' 
--include="1" --include="2" --include="3"
21:14( echo $b )
->ksh
$ read b
1 2 3
$ echo $b
1 2 3
$ sed 's/\S\+/--include="&"/g' <<<$b
--include="1" --include="2" --include="3"
$ echo $b | sed 's/\S\+/--include="&"/g'
--include="1" --include="2" --include="3"

echo "$b" | sed 's/\S\+/--include="&"/g'

sed 's/[^ ]*/--include="&"/g'