# Require a controlling input `terminal'.

tty -s || have_input_tty=no
test -t 1 || have_input_tty=no
if test "$have_input_tty" = no; then
  echo "$0: This test must have a controlling input \`terminal'," 1>&2
  echo "  so it may not be run via \`batch', \`at', or \`rsh'." 1>&2
  echo "  On some systems, it may not even be run in the background." 1>&2
  (exit 77); exit 77
fi