报错：
Cannot find ./catalina.sh
The file is absent or does not have execute permission
This file is needed to run this program
原因：
没有给bin目录下的文件授权可执行权限：
解决方法：
chmod +x bin/*.sh
报错Neither the JAVA_HOME nor the JRE_HOME environment variable is defined：
解决方法如下：
tomcat启动脚本文件： startup.sh, startup.sh会加载 catalina.sh , catalina.sh会加载setclasspath.sh
Linux： export JAVA_HOME=绝对路径 Windows： set
可以直接添加到第二行：
#!/bin/sh
export JAVA_HOME=/usr/local/java1.8
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
成功
[root@hadoop1 apache-tomcat-8.0.43]# sudo bin/startup.sh
/home/report/apache-tomcat-8.0.43/bin/catalina.sh:行143: -Xmx1024m: 未找到命令
Using CATALINA_BASE: /home/report/apache-tomcat-8.0.43
Using CATALINA_HOME: /home/report/apache-tomcat-8.0.43
Using CATALINA_TMPDIR: /home/report/apache-tomcat-8.0.43/temp
Using JRE_HOME: /home/jdk-10.0.1
Using CLASSPATH: /home/report/apache-tomcat-8.0.43/bin/bootstrap.jar:/home/report/apache-tomcat-8.0.43/bin/tomcat-juli.jar
Tomcat started.
以上是在catalina.sh文件中添加的。依然存在问题，就是关闭指令运行报错 shutdown.sh
[root@hadoop1 apache-tomcat-8.0.43]# sudo bin/shutdown.sh
/home/report/apache-tomcat-8.0.43/bin/catalina.sh:行143: -Xmx1024m: 未找到命令
Using CATALINA_BASE: /home/report/apache-tomcat-8.0.43
Using CATALINA_HOME: /home/report/apache-tomcat-8.0.43
Using CATALINA_TMPDIR: /home/report/apache-tomcat-8.0.43/temp
Using JRE_HOME: /home/jdk-10.0.1
Using CLASSPATH: /home/report/apache-tomcat-8.0.43/bin/bootstrap.jar:/home/report/apache-tomcat-8.0.43/bin/tomcat-juli.jar./catalina.sh: 1: eval: usrjjdk-10.0.1re/bin/java: not found
还是显示找不到，而且路径 usrjdk-10.0.1jre莫名奇妙少了 '/' 。
解决方法：
把刚刚修改的 export JAVA_HOME环境变量改写到 setclasspath.sh里面，把原先的 catalina.sh export那个删除掉
成功解决:
[root@hadoop1 apache-tomcat-8.0.43]# sudo bin/shutdown.sh
/home/report/apache-tomcat-8.0.43/bin/catalina.sh:行143: -Xmx1024m: 未找到命令
Using CATALINA_BASE: /home/report/apache-tomcat-8.0.43
Using CATALINA_HOME: /home/report/apache-tomcat-8.0.43
Using CATALINA_TMPDIR: /home/report/apache-tomcat-8.0.43/temp
Using JRE_HOME: /home/jdk-10.0.1
Using CLASSPATH: /home/report/apache-tomcat-8.0.43/bin/bootstrap.jar:/home/report/apache-tomcat-8.0.43/bin/tomcat-juli.jar