监控http服务脚本

[root@ob1 scripts]# vim test_httpd.sh 
  1 #!/bin/bash
  2 #ss -tlnup|grep :80 >/dev/null 2>&1
  3 dk=$(ss -tlnup|awk -F"[ :]+" '/80/{print $5}')
  4 if [ "80" = "${dk}" ];then           #use string to compare,num is not have null
  5         echo "httpd is running"
  6 else
  7         echo "restarting"
  8         /etc/init.d/httpd restart >/dev/null 2>&1
  9 fi

如果服务没起就重启,if [ "80" = "${dk}" ];then          在字符串比较80 -eq dk 没起是空的时候报错,写成字符串就不报错应为字符串有空,数字没值会报错