gistfile1.sh

#!/bin/sh

cd ~/monitor

interval=15
columns=20

pidsfile=/tmp/benjaminr-monitor-pids-$$
statusfile=/tmp/benjaminr-monitor-status-$$

while read service; do
  echo "? $service"
done < services > $statusfile

display () {
  clear

  while read status service; do
    if echo "$status" | grep -qv X; then continue; fi

    for i in $(seq $columns); do
      c=$(echo $status | cut -b$i)
      if   test "x$c" = 'x-'; then printf '\33[7m\33[32m '
      elif test "x$c" = 'xX'; then printf '\33[7m\33[31m '
      else printf '\33[0m '; fi
    done

    printf "\33[0m $service\n"
  done < $statusfile
}

# ---
while true; do
# ---

while read status service; do
  check/$service > /dev/null &
  echo "$status $! $service"
done < $statusfile > $pidsfile

sleep $interval

while read status pid service; do
  if wait $pid; then c='-'; else c='X'; fi

  status=$(echo "$c$status" | cut -b-$columns)

  echo "$status $service"
done < $pidsfile > $statusfile

display

# ---
done
# ---