在Linux中使用Shell脚本监视日志并发送警报邮件

Question

I created .sh file to grep specific words in log and will send a mail to particular emailID (Set Cronjob to run this script every 1hour). Its working as expected, But the Problem is if there is no error also I am getting Empty Mail.

Needs to get Mail, if we caught error and DBError file has content. Kindly please help me on this to resolve this issue.

    #!/bin/bash

if [ ! -e DBErrors ] ; then
      grep "sqlException" /opt/apps/cms/logs/cms-runtime.log > DBErrors
      mail -s "ALERT: sqlException" Jayaram.Ponnusamy@gmail.com < DBErrors
else
  comm -23 <(grep "sqlException" /opt/apps/cms/logs/cms-runtime.log) DBErrors | mail -s "ALERT: sqlException" Jayaram.Ponnusamy@gmail.com
  grep "sqlException" /opt/apps/cms/logs/cms-runtime.log > DBErrors
fi

Thanks Jayaram

Answer 1

Could you try this;

#!/bin/bash
dbErrors="/tmp/DBErrors"
if [ ! -e "$dbErrors" ]; then
        grep "sqlException" /opt/apps/cms/logs/cms-runtime.log > $dbErrors
        mailbody=$(grep "sqlException" /opt/apps/cms/logs/cms-runtime.log); [[ -n "$mailbody" ]] && mail -s "ALERT: sqlException" Jayaram.Ponnusamy@gmail.com
else 
        mailbody=$(comm -23 <(grep "sqlException" /opt/apps/cms/logs/cms-runtime.log| sort -n) <(sort -n "$dbErrors")); [[ -n "$mailbody" ]] && mail -s "ALERT: sqlException" Jayaram.Ponnusamy@gmail.com
        grep "sqlException" /opt/apps/cms/logs/cms-runtime.log > $dbErrors
fi