4J

I recently had a question on c.o.l.s about real time process monitoring. Although there is still refinement required, I have my fav solution here:

#!/bin/bash

PROG=$1
N=0
while :
do
       if [ ! -x $PROG ]; then
               echo "$PROG is not executable" >&2
               exit 1
       fi
       if [ $N -lt $SECONDS ]; then
               N=$SECONDS
       elif [ $(($N - 5)) -ge $SECONDS ]; then
               echo "$PROG restarting too frequently -- sleeping" >&2
               sleep 10
       fi
       N=$(($N+1))
       $PROG
done