从crontab发送邮件时，电子邮件正文内容将被删除

Question

I have following command in Ubuntu Linux,

mysql -u root -p"password" "dbname" -e 'select count(*) User_Count from "tableName"' | mail

-s 'Count' "email_id"

When this command is executed from command line it send mail with subject and query output as message body

However if I schedule the same command through crontab - I get email only with subject and message body is empty

Answer 1

That's probably an indicator that mysql is failing to run as specified.

Redirect standard error when you run the command, and you'll at least get an e-mail with the error message telling you what you're missing:

mysql 2>&1 -u root -p -e 'select count(*) User_Count from ' | mail -s 'Count' "email_id"

Also, make sure the directory where mysql resides is either in the PATH, or you specify it manually on the command line.