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Full Discussion: prstat in shell
Top Forums Shell Programming and Scripting prstat in shell Post 302106088 by sb008 on Tuesday 6th of February 2007 01:12:21 PM
Old 02-06-2007
If you check the manual page for prstat you will see that besided a lot of options there are 2 optional arguments for prstat.

These arguments are:
interval (interval in seconds between 2 statistics reports)
count (Number of statistics reports)

So you could use:

prstat 2 5
Make 5 statistics reports with an interval of 2 seconds

prtstat 3
Make endless statistics report with an interval of 3 seconds.

prstat 0 1
Make 1 statistics report with an interval of 0 seconds (The interval is irrelevant here and can be any number, since it's only 1 report).


To process the output of prstat in a scriipt you have to limit the number of statistics reports. Without this limitation prstat would never end and your script with never proceeed.

You can redirect the limited number of statistics reports to some kind of file which you use later on in your script as source to extract/generate/manipulate or whatever.

If you do not which to redirect the output to a file but like to process the outut right away, by piping the output to another command, it would be easiest to start with a single statistics report. Once you know how to parse that kind of information e.g. with (n)awk you count increase the number of statistics reports. But no matter what, make sure the number of statistics reports is limited, or your script will never end.

There are ways to process a continious output stream of prstat, but shell scripting is not really suited for that. Basically you would have 2 programs and are dealing with IPC (Inter Process Communication).
 

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platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME
platform::shell - System identification support code and utilities SYNOPSIS
package require platform::shell ?1.1.4? platform::shell::generic shell platform::shell::identify shell platform::shell::platform shell _________________________________________________________________ DESCRIPTION
The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell. This package allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only requirement is that the other shell (identified by its path), is actually executable on the current machine. While for most platform this means that the architecture of the interrogated shell is identical to the architecture of the running shell this is not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run 32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers. For applications like a code repository it is important to identify the architecture of the shell which will actually run the installed packages, versus the architecture of the shell running the repository software. COMMANDS
platform::shell::identify shell This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell. platform::shell::generic shell This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell. platform::shell::platform shell This command returns the contents of tcl_platform(platform) for the specified Tcl shell. KEYWORDS
operating system, cpu architecture, platform, architecture platform::shell 1.1.4 platform::shell(n)
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