i-bash/tests/lastpipe.tests

binfalse()
{
	$binfalse || return 1	# normalize return value
}

if [ -x /usr/bin/true ]; then
	bintrue=/usr/bin/true
elif [ -x /bin/true ]; then
	bintrue=/bin/true
else
	bintrue=true
fi
if [ -x /usr/bin/false ]; then
	binfalse=/usr/bin/false
elif [ -x /bin/false ]; then
	binfalse=/bin/false
else
	binfalse=true
fi

shopt -s lastpipe

unset foo bar
echo a b c | read foo
echo after 1: foo = $foo

unset tot
declare -i tot
printf "%d\n" 1 2 3 | while read foo; do tot+=$foo; done
echo after 2: tot = $tot

unset bar
echo g h i | bar=7
echo after: $bar

unset foo last
printf "%s\n" a b c | while read foo; do last=$foo; done
echo last = $last

exit 142 | false
echo $? -- ${PIPESTATUS[@]}

true | false | $bintrue
echo $? -- ${PIPESTATUS[@]}

true | $bintrue | false
echo $? -- ${PIPESTATUS[@]}

set -o pipefail
true | $bintrue | false
echo $? -- ${PIPESTATUS[@]}

true | binfalse | true
echo $? -- ${PIPESTATUS[@]}
set +o pipefail

${THIS_SH} ./lastpipe1.sub
echo lastpipe1.sub returns $?

${THIS_SH} ./lastpipe2.sub