mail 和mailx命令
基本语法如下:
mail -s "this is the subject" $MAILOUT_LIST <$MAIL_FILE
OR
cat $MAIL_FILE |mail -s "this is the subject" $MAILOUT_LIST

mailx 同上

sendmail  允许加入-f开关选项来为from字段指明一个合法的内部邮件地址.
sendmail命令在AIX、HP-UX和Linux上大的位置为/usr/sbin/sendmail，但在SunOS上，其位置为/usr/lib/sendmail

function send_notification
{
if [ -s $MAIL_FILE -a "$MAILOUT_LIST" = "TRUE" ];
then
    case $(uname) in
    AIX|HP-UX|Linux) SENDMAIL="/usr/sbin/sendmail"
       ;;
    SunOS) SENDMAIL="/usr/lib/sendmail"
       ;;
    esac
    echo "\nSending e-mail notification"
    $SENDMAIL -f randy@$THISHOST $MAIL_LIST < $MAIL_FILE
fi
}