busybox

v='z1.tmp z2.tmp'

echo TEST >$v

echo 'z1.tmp:' `cat 'z1.tmp' 2>/dev/null; echo $?`

echo 'z2.tmp:' `cat 'z2.tmp' 2>/dev/null; echo $?`

echo '"z1.tmp z2.tmp":' `cat 'z1.tmp z2.tmp' 2>/dev/null; echo $?`

rm z*.tmp