shell script的追踪
$ sh -n restart.sh$
-n：不要执行script，仅仅检查语法，如果正确不会有任何输出，如果有错，则会有提示
$ sh -x restart.sh
+ TOMCAT_HOME=/opt/apache-tomcat-8.0.14
+ cd /opt/apache-tomcat-8.0.14/bin
++ ps -ef
++ grep -v grep
++ wc -l
++ grep /opt/apache-tomcat-8.0.14
+ declare -i count=1
+ '[' 1 -eq 0 ']'
+ echo 'shutdown ......'
shutdown ......
+ ./shutdown.sh
Using CATALINA_BASE: /opt/apache-tomcat-8.0.14
Using CATALINA_HOME: /opt/apache-tomcat-8.0.14
Using CATALINA_TMPDIR: /opt/apache-tomcat-8.0.14/temp
Using JRE_HOME: /usr/java/jdk1.8.0_25
Using> ++ ps -ef
++ grep /opt/apache-tomcat-8.0.14
++ grep -v grep
++ wc -l
+ count=1
+ '[' 1 -ne 0 ']'
++ ps -ef
++ grep /opt/apache-tomcat-8.0.14
++ grep -v grep
++ awk '{print $2}'
+ declare -i pid=14433
+ kill 14433
+ echo 'tomcat is down'
tomcat is down
+ ./startup.sh
Using CATALINA_BASE: /opt/apache-tomcat-8.0.14
Using CATALINA_HOME: /opt/apache-tomcat-8.0.14
Using CATALINA_TMPDIR: /opt/apache-tomcat-8.0.14/temp
Using JRE_HOME: /usr/java/jdk1.8.0_25
Using> Tomcat started.
+ exit 0
$
-x:执行并输出script
$ sh -v restart.sh
#!/bin/bash
TOMCAT_HOME=${TOMCAT_HOME:=/opt/apache-tomcat-8.0.14}
cd $TOMCAT_HOME/bin
declare -i count=`ps -ef|grep $TOMCAT_HOME|grep -v "grep"|wc -l`
ps -ef|grep $TOMCAT_HOME|grep -v "grep"|wc -l
if [ $count -eq 0 ];then
echo "tomcat is not started"
else
echo "shutdown ......"
./shutdown.sh
count=`ps -ef|grep $TOMCAT_HOME|grep -v "grep"|wc -l`
if [ $count -ne 0 ];then
declare -i pid=`ps -ef|grep $TOMCAT_HOME|grep -v "grep"|awk '{print $2}'`
kill $pid
fi
echo "tomcat is down"
fi
./startup.sh
shutdown ......
Using CATALINA_BASE: /opt/apache-tomcat-8.0.14
Using CATALINA_HOME: /opt/apache-tomcat-8.0.14
Using CATALINA_TMPDIR: /opt/apache-tomcat-8.0.14/temp
Using JRE_HOME: /usr/java/jdk1.8.0_25
Using> ps -ef|grep $TOMCAT_HOME|grep -v "grep"|wc -l
ps -ef|grep $TOMCAT_HOME|grep -v "grep"|awk '{print $2}'
tomcat is down
Using CATALINA_BASE: /opt/apache-tomcat-8.0.14
Using CATALINA_HOME: /opt/apache-tomcat-8.0.14
Using CATALINA_TMPDIR: /opt/apache-tomcat-8.0.14/temp
Using JRE_HOME: /usr/java/jdk1.8.0_25
Using> Tomcat started.
exit 0
$
-v:先输出，后执行，红色部分就是脚本，这个是tomcat重启的脚本
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