JMXterm 命令从终端手动运行，而不是从脚本运行，可能是什么原因？

Question

我正在尝试使用名为 JMXterm 的工具自动执行 JMX 命令。

脚本如下所示：

#!/bin/bash
beanstemp="/tmp/jmx_beans"
read -r -p "Enter server name in FQDN " scrapername
bean1="BrokerName=localhost,Connection=Scraper_$scrapername,ConnectorName=openwire,Type=Connection"
echo beans -d $domain | $cmd  > $beanstemp
idnum=$(grep "ID_$scrapername" $beanstemp | grep openwire | awk -F- '{print "-"}')
idname="$scrapername-$idnum"
bean2="BrokerName=localhost,Connection=ID_"$idname"2_0,ConnectorName=openwire,Type=Connection"
domain="org.apache.activemq"
server="scrapermq.sj.peer39.com:1099"
cmd="java -jar Downloads/jmxterm-1.0-alpha-4-uber.jar -l $server"

echo run stop -b $bean1 -d $domain | $cmd -l $server
echo run stop -b $bean2 -d $domain | $cmd -l $server

当我运行脚本时，我得到了第一个命令的正确响应，但第二个命令失败了。

这是 sh -x 的输出：

itaig@iganot-lt:~$ sh -x jmx.sh 
+ beanstemp=/tmp/jmx_beans
+ read -r -p Enter server name in FQDN  scrapername
Enter server name in FQDN selvmnj27.domain.company.com
+ bean1=BrokerName=localhost,Connection=Scraper_selvmnj27.domain.company.com,ConnectorName=openwire,Type=Connection
+ echo beans -d
+ 
+ + grep openwire
grep ID_selvmnj27.domain.company.com+ awk -F- {print "-"}
 /tmp/jmx_beans
+ idnum=
+ idname=selvmnj27.domain.company.com-
+ bean2=BrokerName=localhost,Connection=ID_selvmnj27.domain.company.com-2_0,ConnectorName=openwire,Type=Connection
+ domain=org.apache.activemq
+ server=scrapermq.sj.peer39.com:1099
+ cmd=java -jar Downloads/jmxterm-1.0-alpha-4-uber.jar -l scrapermq.sj.peer39.com:1099
+ echo+  run stop -b BrokerName=localhost,Connection=Scraper_selvmnj27.domain.company.com,ConnectorName=openwire,Type=Connectionjava -jar -d Downloads/jmxterm-1.0-alpha-4-uber.jar -l org.apache.activemq scrapermq.sj.peer39.com:1099 -l
 scrapermq.sj.peer39.com:1099
Welcome to JMX terminal. Type "help" for available commands.
$>run stop -b BrokerName=localhost,Connection=Scraper_selvmnj27.domain.company.com,ConnectorName=openwire,Type=Connection -d org.apache.activemq
#calling operation stop of mbean org.apache.activemq:BrokerName=localhost,Connection=Scraper_selvmnj27.domain.company.com,ConnectorName=openwire,Type=Connection
#operation returns: 
null
$>+ + echo runjava stop -b -jar Downloads/jmxterm-1.0-alpha-4-uber.jar BrokerName=localhost,Connection=ID_selvmnj27.domain.company.com-2_0,ConnectorName=openwire,Type=Connection -l scrapermq.sj.peer39.com:1099 -l -d scrapermq.sj.peer39.com:1099
 org.apache.activemq
Welcome to JMX terminal. Type "help" for available commands.
$>run stop -b BrokerName=localhost,Connection=ID_selvmnj27.domain.company.com-2_0,ConnectorName=openwire,Type=Connection -d org.apache.activemq
#InstanceNotFoundException: org.apache.activemq:BrokerName=localhost,Connection=ID_selvmnj27.domain.company.com-2_0,ConnectorName=openwire,Type=Connection
$>itaig@iganot-lt:~$

"Operation returns: null" 是我正在寻找的响应。

问题从这一行开始：

echo beans -d $domain | $cmd  > $beanstemp

当它运行时，命令的输出应该写入 $beanstemp 文件，但该文件保持为空。

当我从终端手动运行命令时，它起作用了：

itaig@iganot-lt:~$ echo beans -d org.apache.activemq | java -jar Downloads/jmxterm-1.0-alpha-4-uber.jar  -l  scrapermq.domain.company.com:1099 > /tmp/jmx_beans
Welcome to JMX terminal. Type "help" for available commands.
$>beans -d org.apache.activemq
#domain = org.apache.activemq:
$>itaig@iganot-lt:~$ tail -5 /tmp/jmx_beans
org.apache.activemq:BrokerName=localhost,Type=Subscription,clientId=Scraper_selvmnj28.domain.company.com,consumerId=ID_selvmnj28.domain.company.com-45117-1431866382308-0_416_1_1,destinationName=SCRAPER_VIDEO_INPUT,destinationType=Queue,persistentMode=Non-Durable
org.apache.activemq:BrokerName=localhost,Type=Subscription,clientId=Scraper_selvmnj29.domain.company.com,consumerId=ID_selvmnj29.domain.company.com-52961-1431866382264-0_416_-1_1,destinationName=topic_//ActiveMQ.Advisory.TempQueue_topic_//ActiveMQ.Advisory.TempTopic,destinationType=Topic,persistentMode=Non-Durable
org.apache.activemq:BrokerName=localhost,Type=Subscription,clientId=Scraper_selvmnj29.domain.company.com,consumerId=ID_selvmnj29.domain.company.com-52961-1431866382264-0_416_1_1,destinationName=SCRAPER_VIDEO_INPUT,destinationType=Queue,persistentMode=Non-Durable
org.apache.activemq:BrokerName=localhost,Type=Subscription,clientId=Scraper_selvmnj30.domain.company.com,consumerId=ID_selvmnj30.domain.company.com-33036-1431866396456-0_416_-1_1,destinationName=topic_//ActiveMQ.Advisory.TempQueue_topic_//ActiveMQ.Advisory.TempTopic,destinationType=Topic,persistentMode=Non-Durable
org.apache.activemq:BrokerName=localhost,Type=Subscription,clientId=Scraper_selvmnj30.domain.company.com,consumerId=ID_selvmnj30.domain.company.com-33036-1431866396456-0_416_1_1,destinationName=SCRAPER_VIDEO_INPUT,destinationType=Queue,persistentMode=Non-Durable
itaig@iganot-lt:~$

所以我的问题是：我做错了什么以及为什么当运行从终端手动而不是从脚本手动执行命令时命令有效？

提前致谢

Answer 1

好的，我找到问题了。

某些行包含未及时声明的变量。重新整理变量声明顺序后问题解决

JMXterm 命令从终端手动运行，而不是从脚本运行，可能是什么原因？

JMXterm command works manually from terminal but not from script, what could be the reason?

jmx