Wach directory/files and run command repeatedly

rerun_yard.sh

#!/bin/sh

# About rerun: [alexch/rerun: Restarts an app when the filesystem changes. Uses growl and FSEventStream if on OS X.](https://github.com/alexch/rerun/)
# About yard: [YARD - A Ruby Documentation Tool](https://yardoc.org/)

# Note: specify `-d [directory where not same directory level of .yard]` option to avoid endless loop
rerun -d app -c "rm -rf .yard && yard doc && ./yard_server.sh restart"

yard_server.sh

#!/bin/sh

# Original: https://stackoverflow.com/questions/8509177/how-i-can-run-yard-server-on-production-server

# For debug
# set -x
# set -e

# or you process here
PROCESS='ruby */yard server'
PID=`pidof $PROCESS`

start() {
  # yard server &
  yard server
}

stop() {
  # if [ "$PID" ];then
  #   kill -KILL $PID
  #   echo 'yard is stopped'
  # fi

  # Add some process for rerun
  for PID_S in $PID; do
    NAME=`ps -p $PID_S -o comm=`
    if [ "$PID_S" ] && [ "$NAME" != "rerun" ];then
      kill -KILL $PID_S
      echo 'yard is stopped'
    fi
  done
}

case "$1" in
start)
  start
;;
stop)
  stop
;;
restart)
  stop
  start
;;
*)
echo Usage: $0 [start|stop|restart]
;;
esac