linux - 停止 shell 脚本发送重复的电子邮件 - 使用文件标志

Question

我的要求是，如果我在日志文件中找到字符串，则发送电子邮件；但是，我应该只发送一次。下面贴出我写的shell脚本；但是，即使条件不匹配，它也会通过 cron 作业发送重复的电子邮件。

#!/bin/bash
filexists=""
lbdown=""`enter code here`
if [ -f "/var/run/.mailsenttoremedy" ];
then
   filexists=true
else
   filexists=false
echo filexists is $filexists
fi

if tail -1000 /usr/ibm/tivoli/common/CTGIM/logs/trace.log | grep "Root exception is java.net.NoRouteToHostException: No route to host"
then
    echo error found
        lbdown=true
echo lbdown status after if in tail is $lbdown
else
lbdown=false
echo lbdown status after else in tail is $lbdown 
fi

if filexists=false && lbdown=true
then
{
mailx -S intrelay.sysco.com -r xxx@yyy.com -s "**DEV ALERT**Load Balancer Connection not Available" -v xxx@yyy.com < /dev/null
date > /var/run/.mailsenttoremedy
}
fi

if filexists=true && lbdown=true
then
{
echo MAIL ALREADY SENT
}
fi

if lbdown=false
then
rm -f /var/run/.mailsenttoremedy
fi
echo lbdown is $lbdown and filexists is $filexists

echo 输出是:

filexists is false
Root exception is java.net.NoRouteToHostException: No route to host
error found
lbdown status after if in tail is true
Null message body; hope that's ok
Mail Delivery Status Report will be mailed to <xxx@yyy.com>.
MAIL ALREADY SENT
lbdown is false and filexists is true

Answer 1

您可以尝试对 if 请求进行正常声明...

Bash 格式:

if [ $(tail -1000 /usr/ibm/tivoli/common/CTGIM/logs/trace.log | grep "Root exception is java.net.NoRouteToHostException: No route to host") != "" ];
then

if  [ "$filexists" = "false" ] && [ "$lbdown" = "true" ];
then

if [ "$lbdown" = "false" ];
then

通过 if 的测试命令应该被 [ 和 ] 包围，至少是具有多个条件的命令。这是guide for if and some sample codes如果您有兴趣。

此外，变量前面至少需要有一个$。通常它们也被 { 和 } 包围。

PS。您可以为帖子使用更好的格式，这样人们就不会给您投反对票。