Shell脚本检测Tomcat是否正在运行

#!/bin/sh
# configurations
# computer 设备名称
# target 监控目标
# watcher 跟踪者（邮箱）

computer="ehetong"
target="home/ehetong/apache-tomcat-7.0.33"
date_time=$(date +%c)

# 收件人
email_addressee="952589031@qq.com 823633682@qq.com"
# 发件人
email_sender="do-not-reply@itrusign.cn"
# 发件人用户名
email_user="do-not-reply@itrusign.cn"
# 发件人密码
email_password="XXXXXXXXXXXXXXXXXXXXXXXXXXXX"
# smtp服务器地址
email_smtp="smtp.exmail.qq.com"

# 邮件标题
email_title=${computer}"机器TOMCAT进程意外关闭-"${date_time}
# 邮件内容
email_content=${computer}"---"${target}"\n在"${date_time}"，Tomcat进程意外关闭\\nshell脚本搜索不到Tomcat进程PID，请及时处理。"

#tomcat=$(ps -ef|grep $$target | grep -v grep | awk '{print $2}')
tomcat=`ps -ef|grep $target | grep -v 'grep\|tail' | awk '{print $2}'`

#file_path=""
# 附件
# file_path=""
# -a ${file_path} 

if test -z ${tomcat}
then
    echo $(date +%F" "%T)"--info--:准备发送邮件"
    /usr/local/bin/sendEmail -f ${email_sender} -t ${email_addressee} -s ${email_smtp} -u ${email_title} -xu ${email_user} -xp ${email_password} -m ${email_content} -o message-charset=utf-8
    echo $(date +%F" "%T)"--info--:发送邮件成功"
else
    echo $(date +%F" "%T)"--info--:tomcat进程存在，pid="${tomcat}
fi