Create Linux service wrapper script

遠端登入 Linux 操作，每次啟動不因遠端登出而關閉的程式 (program)，或是關閉上一次運行的程序 (process)，都需要輸入許多指令，對於不熟 Linux 新手的我來說，這有點麻煩啊。因此有這懶人包 bash script，一個包裝將程式包裝成 service 的腳本，協助 start/stop/restart process。

使用 nohup 啟用程式，並使用暫存檔記錄該次執行的 pid。當要停止該程序時，讀取該暫存檔 pid，然後關閉該程序 (kill process)。

#!/bin/bash
SERVICE_NAME=My-Service-Name
PATH_BIN=Binary-Path
PID_PATH_NAME=/tmp/AppName-pid
case $1 in
   start)
      echo "$SERVICE_NAME starting ..."
      if [ ! -f $PID_PATH_NAME ]; then
         nohup $PATH_BIN &
                  echo $! > $PID_PATH_NAME
         echo "$SERVICE_NAME started ..."
      else
         echo "$SERVICE_NAME is already running ..."
      fi
   ;;
   stop)
      if [ -f $PID_PATH_NAME ]; then
         PID=$(cat $PID_PATH_NAME);
         echo "$SERVICE_NAME stoping ..."
         kill $PID;
         echo "$SERVICE_NAME stopped ..."
         rm $PID_PATH_NAME
      else
         echo "$SERVICE_NAME is not running ..."
      fi
   ;;
   restart)
      if [ -f $PID_PATH_NAME ]; then
         PID=$(cat $PID_PATH_NAME);
         echo "$SERVICE_NAME stopping ...";
         kill $PID;
         echo "$SERVICE_NAME stopped ...";
         rm $PID_PATH_NAME
         echo "$SERVICE_NAME starting ..."
         nohup $PATH_BIN &
                  echo $! > $PID_PATH_NAME
         echo "$SERVICE_NAME started ..."
      else
         echo "$SERVICE_NAME is not running ..."
      fi
   ;;
   *)
      echo $"Usage: $0 {start|stop|restart}"
      exit 1
esac 
exit 0