Bash Script for Managing Nginx Service (start, stop, reload, status)

The article introduces a Bash script for managing the Nginx web server, illustrating how to use a case statement where each pattern ends with a right parenthesis and commands are executed until a double semicolon ( ;; ), similar to a break in other languages.

It first explains the case syntax, noting that the value after case must be a keyword such as in , and that if no pattern matches, the wildcard * can be used to handle the default case.

The script defines several helper functions:

#!bin/bash
source /etc/init.d/functions
act=$1
te(){
  if [ $? -eq 0 ]; then
    action "Nginx Is $act" /bin/true
  else
    action "Nginx Is $act" /bin/false
  fi
}

start(){
  /usr/sbin/nginx &>/dev/null
  te
}

stop(){
  /usr/sbin/nginx -s stop &>/dev/null
  te
}

reload(){
  /usr/sbin/nginx -s reload
  te
}

status(){
  Ngx_status=$(ps aux|grep "[n]ginx"|egrep -v "vi|sh"|grep master|awk '{print $2}')
  Nginx_Status_Port=$(netstat -lntp|grep nginx|awk '{print $4}')
  echo "Nginx_status_Pid: $Ngx_status"
  echo "Nginx_status_Port: $Nginx_Status_Port"
}

case $1 in
  start)
    start
    ;;
  stop)
    stop
    ;;
  restart)
    stop
    sleep 1
    start
    ;;
  reload)
    reload
    ;;
  status)
    status
    ;;
  *)
    echo "Usage: $0 {start|stop|status|restart|reload|}"
    ;;
esac

By invoking the script with arguments such as start , stop , restart , reload , or status , users can control the Nginx service directly from the command line, with the helper function te reporting success or failure.