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Full Discussion: An Idea for Tokenizing
Top Forums Shell Programming and Scripting An Idea for Tokenizing Post 73945 by neked on Monday 6th of June 2005 06:11:12 PM
Old 06-06-2005
An Idea for Tokenizing
One of the monitoring tools in Java is called `jps`, and it monitors all Java processes that are run by the user, an example output would be like this:

3459 Jps
2348 test
2311 Util

where the first column represents Process IDs and the second column represents Java processes names. Therefore, if I wanted to find the process ID for some Java process, say test, I could type `jps | grep test` and then take the first argument in the line, which would be the process ID.

Now I had an idea to do it in a simpler way (rather than just writing a C or Java program), I could write a simple sh script that goes like this (call it tokenizer)

Code:
#!bin/sh
echo $1

and by typing `chmod +x tokenizer` and then: `jps | grep test | tokenizer` I would think I should get 2348 as an output to the shell, which is the PID for `test` Java process, but that did not happen. Anybody know why?
 

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LEARN ABOUT MOJAVE

jmap

jmap(1) 						      General Commands Manual							   jmap(1)

NAME

       jmap - memory map

SYNOPSIS

       jmap [ option ] pid
       jmap [ option ] executable core
       jmap [ option ] [ server-id@ ] remote-hostname-or-IP

DESCRIPTION

       jmap prints shared object memory maps or heap memory details of a given process or core file or remote debug server.

       NOTE  - This utility is unsupported and may or may not be available in future versions of the J2SE SDK.	jmap is not currently available on
       Windows platforms or on the Linux Itanium platform.

PARAMETERS

       option	      Options are mutually exclusive. Option, if used, shouldfollow immediately after the command name.

       pid	      process id for which the memory map is to be printed.  The process must be a Java process. To get a list of  Java  processes
		      running on a machine, jps may be used.

       executable     Java executable from which the core dump was produced.

       core	      core file for which the memory map is to be printed.

       remote-hostname-or-IP
		      remote debug server's (see jsadebugd) hostname or IP address.

       server-id      optional unique id, if multiple debug servers are running on the same remote host.

OPTIONS

	<no option>   When  no	option	is used jmap prints shared object mappings. For each shared object loaded in the target VM, start address,
		      the size of the mapping, and the full path of the shared object file are printed. This is similar to the Solaris pmap  util-
		      ity.

       -heap	      Prints a heap summary. GC algorithm used, heap configuration and generation wise heap usage are printed.

       -histo	      Prints  a  histogram  of	the  heap. For each Java class, number of objects, memory size in bytes, and fully qualified class
		      names are printed. VM internal class names are printed with '*' prefix.

       -permstat      Prints class loader wise statistics of permanent generation of Java  heap.  For  each  class  loader,  its  name,  liveness,
		      address, parent class loader, and the number and size of classes it has loaded are printed.

       -h	      Prints a help message.

       -help	      Prints a help message.

SEE ALSO

       pmap(1) jps(1) jsadebugd(1)

								   13 June 2004 							   jmap(1)
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