start , stop , monitor "python app.py"

startStopMonitor.sh

# !/bin/ksh 



Init()
     {
             #(1) Set a work directory
             WORK_DIR="$( pwd )/work"
             if [ ! -d ${WORK_DIR} ]
             then
                 mkdir $WORK_DIR
                 if [ $? -ne 0 ]
                 then
                      WORK_DIR=$( pwd )
                 fi
             fi
        
             #(2) All the directories where  logs are located
             LOG_DIR="${WORK_DIR}/log"
             if [ ! -d ${LOG_DIR} ]
             then
                 mkdir $LOG_DIR
                 if [ $? -ne 0 ]
                 then
                      LOG_DIR=$( pwd )
                 fi
             fi  
              
           
             
            #(3) Set Flag Names for START/STOP
            procName="python_app_py"
            START_FLAG=${WORK_DIR}/${procName}.started
            STOP_FLAG=${WORK_DIR}/${procName}.stopped
    }
    
    
startIt()
   {
            echo -e "\n \033[36m .....Attempting Start  ${procName} ! \033[0m \n"
        
            if [ -e ${STOP_FLAG} ]
            then
                rm -f ${STOP_FLAG}
            fi

           logFile=${LOG_DIR}/$$.out.log
           errorFile=${LOG_DIR}/$$.error.log
             
            if [ -e ${START_FLAG} ]
                    then
                        echo " .................Seems Process is already Started (flag exists). Checking for daemon ! "
                        for pid in $( ps -efl | grep -v grep | grep "python app.py" | awk -F" " '{print $2}' )
                        do
                            echo "${procName} is running with pid ${pid}"
                        done
                    else
                         ( python app.py  1>>${logFile} 2>>${errorFile}) &
                        if [ "$!"  != "" ]
                        then
                            echo -e "\n \033[36m ..... Process Initiated with pid $!  ! \033[0m \n" 
                            touch $START_FLAG
                        else
                            echo -e "\n \033[36m .....Trouble Starting  your Process ! \033[0m \n"
                        fi
                        
            fi


  }
  
  
  
stopIt()
{
    echo -e "\n \033[36m .....Setting flags to stop ${procName} ! \033[0m \n"
    touch ${STOP_FLAG}
    rm -f ${START_FLAG}
    for pid in $( ps -efl | grep -v grep | grep "python app.py" | awk -F" " '{print $2}' )
    do
        echo -e "\n \033[36m .....Stopping ${pid} now \033[0m "
        kill -9 ${pid}
    done
    echo -e "\n \033[36m ..... Stopped Process  \033[0m \n" 
   
}

monitorIt()
{

  if [ -e ${STOP_FLAG} ]
  then
       echo " Process stopped by User , not starting it . If you want this to be started , remove ${STOP_FLAG} " 
  else
       startIt

  fi      
    
}


main()
{
    Init $*

   if [[ "$1" != "start" && "$1" != "stop" && "$1" != "monitor" ]] 
   then
             echo -e "\n \033[36m ..... INVALID OPTION  \033[0m "
             echo -e " \033[36m .....        USAGE :: \033[0m "
             echo -e " \033[36m .....             ./startStopMonitor.sh  start  \033[0m "
             echo -e " \033[36m .....             OR :: \033[0m "
             echo -e " \033[36m .....             ./startStopMonitor.sh  stop  \033[0m "
             echo -e " \033[36m .....             OR :: \033[0m "
             echo -e " \033[36m .....             ./startStopMonitor.sh  monitor  \033[0m "
             echo -e "\n \n"
   else
         ${1}It  

   fi
   

}



main $*