man jps「建议收藏」

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man jps

jps(1)                                                                                                              jps(1)

Name
       jps – Java Virtual Machine Process Status Tool

SYNOPSIS
       jps [ options ] [ hostid ]

PARAMETERS
          options
          Command-line options.

          hostid
         The  host  identifier  of  the  host for which the process report should be generated. The hostid may include
         optional components that indicate[指示] the communications protocol, port number, and other implementation specific
         data.

DESCRIPTION
       The  jps tool lists the instrumented【手段，工具】 HotSpot Java Virtual Machines (JVMs) on the target system. The tool is limited
       to reporting information on JVMs for which it has the access permissions[许可，权限].

       If jps is run without specifying a hostid, it will look for instrumented JVMs on the local host. If started with  a
       hostid,  it  will  look  for JVMs on the indicated host, using the specified protocol and port. A jstatd process is
       assumed【呈现】 to be running on the target host.

       The jps command will report the local VM identifier, or lvmid, for each instrumented JVM found on the  target  sys‐
       tem.  The  lvmid  is typically, but not necessarily, the operating system’s process identifier for the JVM process.
       With no options, jps will list each Java application’s lvmid followed by the short form of the application’s  class
       name  or  jar file name. The short form of the class name or JAR file name omits[省略；遗漏；删除；疏忽] the class’s package information or
       the JAR files path information.

       The jps command uses the java launcher to find the class name and arguments passed to the main method. If the  tar‐
       get  JVM  is started with a custom launcher, the class name (or JAR file name) and the arguments to the main method
       will not be available. In this case, the jps command will output the string Unknown for the class name or JAR  file
       name and for the arguments to the main method.

       The list of JVMs produced by the jps command may be limited by the permissions granted to the principal running the
       command. The command will only list the JVMs for which the principle[原理，原则] has access rights as determined  by  operating
       system specific access control mechanisms[机制；机构].

       NOTE:  This  utility[实用；效用；公共设施；功用]  is  unsupported  and  may not be available in future versions of the JDK. It is not currently
       available on Windows 98 and Windows ME platforms.

OPTIONS
       The jps command supports a number of options that modify the output of the command. These options  are  subject  to
       change or removal[免职；移动；排除；搬迁] in the future.

          -q Suppress【抑制；镇压；废止】 the output of the class name, JAR file name, and arguments passed to the main method, producing only
             a list of local VM identifiers.

          lester@lester-ThinkPad-T410:~/study/jps$ jps -q
          3007
          5405
          6703
          3545

          -m Output the arguments passed to the main method. The output may be null for embedded[嵌入式的；植入的；内含的] JVMs.
           lester@lester-ThinkPad-T410:~/study/jps$ jps -m
           3007
           5405 Jstat -gcutil -h5 -t 3007 1s
           6731 Jps -m
           3545 HighUS

          -l Output the full package name for the application’s main class or the full path name to the application’s  JAR
             file.
          lester@lester-ThinkPad-T410:~/study/jps$ jps -l
          6755 sun.tools.jps.Jps
          3007
          5405 sun.tools.jstat.Jstat
          3545 bezier.HighUS
          lester@lester-ThinkPad-T410:~/study/jps

          -v Output the arguments passed to the JVM.
          lester@lester-ThinkPad-T410:~/study/jps$ jps -v
          3007  -Dosgi.requiredJavaVersion=1.5 -Dhelp.lucene.tokenizer=standard -XX:PermSize=512m -XX:+DisableExplicitGC -XX:+UserParNewGC         -XX:+UserConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=80 -XX:+UseCMSInitiatingOccupancyOnly -XX:+PrintGCDetails -xx:+PrintGCTimeStamps -Xloggc:/home/lester/develop/eclipse/lester_gc_log -Xms512m -Xmx512m -XX:MaxPermSize=256m
          5405 Jstat -Denv.class.path=:.:/home/lester/develop/jdk1.6.0_37/lib -Dapplication.home=/home/lester/develop/jdk1.6.0_37 -Xms8m
          6787 Jps -Denv.class.path=:.:/home/lester/develop/jdk1.6.0_37/lib -Dapplication.home=/home/lester/develop/jdk1.6.0_37 -Xms8m
          3545 HighUS -Dfile.encoding=UTF-8

          -V Output  the  arguments passed to the JVM through the flags file (the .hotspotrc file or the file specified by
             the -XX:Flags=<filename> argument).
          lester@lester-ThinkPad-T410:~/study/jps$ jps -V
          3007
          5405 Jstat
          6817 Jps
          3545 HighUS

          -Joption
             Pass option to the java launcher called by jps.  For  example,  -J-Xms48m  sets  the  startup  memory  to  48
             megabytes. It is a common convention for -J to pass options to the underlying VM executing applications writ‐
             ten in Java.

   HOST IDENTIFIER
          The host identifier, or hostid is a string that indicates the target system. The syntax  of  the  hostid  string
          largely corresponds to the syntax of a URI:

          [protocol:][[//]hostname][:port][/servername]

             protocol
                The  communications protocol. If the protocol is omitted【遗漏，省略】 and a hostname is not specified, the default pro‐
                tocol is a platform specific[特定的], optimized【最优】, local protocol. If the protocol is  omitted  and  a  hostname  is
                specified[规定的；详细说明的], then the default protocol is rmi.

             hostname
                A  hostname  or IP address indicating[表明；指示] the target host. If hostname is omitted, then the target host is the
                local host.

             port
                The default port for communicating with the remote server. If the hostname  is  omitted  or  the  protocol
                specifies  an  optimized, local protocol, then port is ignored. Otherwise, treatment of the port parameter
                is implementation specific. For the default rmi protocol the  port  indicates  the  port  number  for  the
                rmiregistry  on  the remote host. If port is omitted, and protocol indicates rmi, then the default rmireg‐
                istry port (1099) is used.

             servername
                The treatment of this parameter depends on the implementation. For the  optimized,  local  protocol,  this
                field is ignored. For the rmi protocol, this parameter is a string representing the name of the RMI remote
                object on the remote host. See the -n option for the jstatd(1) command.

OUTPUT FORMAT
       The output of the jps command follows the following pattern:

       lvmid [ [ classname | JARfilename | “Unknown”] [ arg* ] [ jvmarg* ] ]

       Where all output tokens are separated by white space. An arg that includes  embedded【嵌入式的；植入的；内含的】  white  space  will  introduce
       ambiguity[含糊；不明确] when attempting to map arguments to their actual positional【位置的；地位的】 parameters.

       NOTE:  You  are advised not to write scripts to parse jps output since the format may change in future releases. If
       you choose to write scripts that parse jps output, expect to modify them for future releases of this tool.

EXAMPLES
       This section provides examples of the jps command.

       Listing the instrumented JVMs on the local host:

       jps

       18027 Java2Demo.JAR

       18032 jps

       18005 jstat

       Listing the instrumented JVMs on a remote host:

       This example assumes that the jstat server and either the its internal RMI registry or a separate external  rmireg‐
       istry  process  are running on the remote host on the default port (port 1099). It also assumes that the local host
       has appropriate permissions to access the remote host. This example also includes the -l option to output the  long
       form of the class names or JAR file names.

       jps -l remote.domain

       3002 /opt/jdk1.5.0/demo/jfc/Java2D/Java2Demo.JAR

       2857 sun.tools.jstatd.jstatd

       Listing the instrumented JVMs on a remote host with a non-default port for the RMI registry

       This  example  assumes  that the jstatd server, with an internal RMI registry bound to port 2002, is running on the
       remote host. This example also uses the -m option to include the arguments passed to the main method of each of the
       listed Java applications.

       jps -m remote.domain:2002

       3002 /opt/jdk1.5.0/demo/jfc/Java2D/Java2Demo.JAR

       3102 sun.tools.jstatd.jstatd -p 2002

SEE ALSO
          o java(1) – the Java Application Launcher

          o jstat(1) – the Java virtual machine Statistics Monitoring Tool

          o jstatd(1) – the jstat daemon

          o rmiregistry(1) – the Java Remote Object Registry

                                                        06 Apr 2010                                                 jps(1)