Fun with terminal plotting JSON data at the command line
One of the great thing about unix is the ability to pipe multiple programs together to manipulate data. Plain, unstructured text is the most common type of data that is passed between programs, but these days JSON is becoming more popular.
I thought it would be fun to pipe together some command line JSON tools to do some stupid terminal tricks, like plotting a graph of system statistics, like CPU or memory utilization.
We can use jc (disclosure: I wrote jc), jq, and jp to pull the output of uptime and display a line graph like this:
In this post I'll show you how you can build a quick bar graph of the CPU utilization of the top processes right in the terminal. For more information on how to create the animated line graph above, see my blog post at blog.kellybrazil.com.
first, get jc, jq, and jp.
Then you can use this one-liner to graph the output of ps:
Fun stuff! jq is an awesome JSON tool for the cli and is a bit like sed or awk for JSON. You'll find lots of uses for manipulating JSON as more and more programs start to output in the format.
Last edited by kbrazil; 01-16-2020 at 04:39 PM..
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Hai Friends
I have installed FreeBSD in my system... I have installed it to work in text mode don't have the GUI. The default text color is Black background with White Foreground. I want it to be with Black background with Green Foreground. How could i do that.
Thanks in advance
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I have a set of data that looks similar to the following in UNIX:
0.12_0.008_fall_ff.out:bisect return: 0.08056640625
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Hello,
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I will give an example of what I'm trying to do here:
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#
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______________________________________________
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Dear All,
Anyone knows how to start a new bash terminal from command line?
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Hi guys and gals...
After much searching on the good ol' internet I could find nothing, so this is the result.
ALthough many people seem to have asked this question no-one seems to have a solution so here we go.
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Hi Gurus,
I have below JSON file, now I want to rewrite this file into a new file.
I will appreciate if anyone can help me to provide the solution...I can't use jq.
{
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"_rev": "1-1f0ce165e1d210319cf6e9f9c6ff654f",
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Discussion started by: manas_ranjan
4 Replies
LEARN ABOUT DEBIAN
cgi::application::plugin::json
CGI::Application::Plugin::JSON(3pm) User Contributed Perl Documentation CGI::Application::Plugin::JSON(3pm)NAME
CGI::Application::Plugin::JSON - easy manipulation of JSON headers
SYNOPSIS
use CGI::Application::Plugin::JSON ':all';
# add_json_header() is cumulative
$self->add_json_header( foo => 'Lorem ipsum...');
$self->add_json_header( bar => [ 0, 2, 3, 4 ] );
$self->add_json_header( baz => { stuff => 1, more_stuff => 2 } );
# json_header() is not cumulative
$self->json_header( foo => 'Lorem ipsum...');
# in case we're printing our own headers
print "X-JSON: " . $self->json_header_string();
# clear out everything in the outgoing JSON headers
$self->clear_json_header();
# or send the JSON in the document body
$self->json_body( { foo => 'Lorem ipsum', bar => [ 0, 2, 3 ] } );
# send the JSON back in the document body, but execute it using a Javascript callback
$self->json_callback('alert', { foo => 'Lorem ipsum', bar => [ 0, 2, 3 ] } );
DESCRIPTION
When communicating with client-side JavaScript, it is common to send data in "X-JSON" HTTP headers or through the document body as content-
type "application/json".
This plugin adds a couple of convenience methods to make that just a little bit easier.
HEADER METHODS
json_header
This method takes name-value pairs and sets them to be used in the outgoing JSON. It is not cummulative and works similarly to
"header_props". Use it only if you have all of the values up front. In most cases add_json_header is probably what you want.
# only the 2nd call will actually set data that will be sent
$self->json_header( foo => 'Lorem ipsum...');
$self->json_header( bar => [ 0, 2, 3, 4 ] );
add_json_header
This method takes name-value pairs and sets them to be used in the outgoing JSON. It is cummulative and works similarly to "header_add";
meaning multiple calls will add to the hash of outgoing values.
# both 'foo' and 'bar' will exist in the hash sent out
$self->json_header( foo => 'Lorem ipsum...');
$self->json_header( bar => [ 0, 2, 3, 4 ] );
clear_json_header
This method will remove anything that was previously set by both json_header and add_json_header. This means that no "X-JSON" header will
be sent.
json_header_string
This method will create the actual HTTP header string that will be sent to the browser. This plugin uses it internally to send the header,
but it might be useful to use directly if you are printing your own HTTP headers (using a "header_type" of "none").
$self->header_type('none');
print $self->json_header_string();
json_header_value
This method will return the values being sent in the JSON header. If you pass in the key of the value you want, you will get just that
value. Else all name-value pairs will be returned.
my $value = $self->json_header_value('foo');
my %values = $self->json_header_value();
BODY METHODS
json_body
This method will take the given Perl structure, turn it into JSON, set the appropriate content-type, and then return the JSON.
return $self->json_body({ foo => 'stuff', bar => [0,1,2,3]} );
json_callback
This method will take the given Perl structure, turn it into JSON, set the appropriate content-type, and then return a Javascript snippet
where the given callback is called with the resulting JSON.
return $self->json_callback('alert', { foo => 'stuff', bar => [0,1,2,3]} );
# would result in something like the following being sent to the client
alert({ foo => 'stuff', bar => [0,1,2,3]});
MISC METHODS
to_json
This method is just a convenient wrapper around JSON::Any's "encode".
from_json
This method is just a convenient wrapper around JSON::Any's "decode".
AUTHOR
Michael Peters, "<mpeters@plusthree.com>"
BUGS
Please report any bugs or feature requests to "bug-cgi-application-plugin-viewsource@rt.cpan.org", or through the web interface at
http://rt.cpan.org/NoAuth/ReportBug.html?Queue=CGI-Application-Plugin-JSON <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=CGI-Application-
Plugin-JSON>. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
COPYRIGHT & LICENSE
Copyright 2006 Michael Peters, All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.12.4 2011-11-11 CGI::Application::Plugin::JSON(3pm)