# Produce 0 if no messages match and standard output is not a tty.
# Note that there is an error message on stderr, but it's redirected
# Produce 0 if no messages match and standard output is not a tty.
# Note that there is an error message on stderr, but it's redirected
# Produce no standard output if no messages match and standard
# output is a tty. To test that even when run with stdout
# detached, write directly to /dev/tty. Can't capture the
# Produce no standard output if no messages match and standard
# output is a tty. To test that even when run with stdout
# detached, write directly to /dev/tty. Can't capture the