mail -s "Title" root

回车后输入邮件内容,内容输完后,按两次ctrl+D键,就发送了. 或者,事先写好邮件保存在mail.txt中.

cat mail.txt | mail -s "Title" root
mail -s "Title" root < mail.txt

再或者:

cat mail.txt | /usr/sbin/sendmail -i root