echo " a " | (read x; echo "$x.")

echo " a  b  " | ( read x y ; echo -"$x"-"$y"- )
echo " a  b\ " | ( read x y ; echo -"$x"-"$y"- )
echo " a  b  " | ( read x ; echo -"$x"- )
echo " a  b\ " | ( read x ; echo -"$x"- )

echo " a  b\ " | ( read -r x y ; echo -"$x"-"$y"- )
echo " a  b\ " | ( read -r x ; echo -"$x"- )

echo "\ a  b\ " | ( read -r x y ; echo -"$x"-"$y"- )
echo "\ a  b\ " | ( read -r x ; echo -"$x"- )
echo " \ a  b\ " | ( read -r x y ; echo -"$x"-"$y"- )
echo " \ a  b\ " | ( read -r x ; echo -"$x"- )

echo "A B " > /tmp/IN
unset x y z
read x y z < /tmp/IN
echo 1: "x[$x] y[$y] z[$z]"
echo 1a: ${z-z not set}
read x < /tmp/IN
echo 2: "x[$x]"
rm /tmp/IN

# this is where the bash `read' behavior with respect to $REPLY differs
# from ksh93
echo "A B " > /tmp/IN

read < /tmp/IN
echo "[$REPLY]"

rm /tmp/IN

echo " A B " > /tmp/IN

read < /tmp/IN
echo "[$REPLY]"

rm /tmp/IN

# make sure that read with more variables than words sets the extra
# variables to the empty string

bvar=bvar
cvar=cvar
echo aa > /tmp/IN
read avar bvar cvar < /tmp/IN
echo =="$avar"==
echo =="$bvar"==
echo =="$cvar"==

rm /tmp/IN

# test behavior of read with various settings of IFS

echo " foo" | { IFS= read line; recho "$line"; }

echo " foo" | { IFS= ; read line; recho "$line"; }

echo " foo" | { unset IFS ; read line; recho "$line"; }

echo " foo" | { IFS=$'\n' ; read line; recho "$line"; }

echo " foo" | { IFS=$' \n' ; read line; recho "$line"; }

echo " foo" | { IFS=$' \t\n' ; read line; recho "$line"; }

echo " foo" | { IFS=$':' ; read line; recho "$line"; }