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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After much searching on the good ol' internet I could find nothing, so this is the result.
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Hi Gurus,
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Discussion started by: manas_ranjan
4 Replies
LEARN ABOUT DEBIAN
json::rpc::server::daemon
JSON::RPC::Server::Daemon(3pm) User Contributed Perl Documentation JSON::RPC::Server::Daemon(3pm)NAME
JSON::RPC::Server::Daemon - JSON-RPC sever for daemon
SYNOPSIS
# Daemon version
#--------------------------
# In your daemon server script
use JSON::RPC::Server::Daemon;
JSON::RPC::Server::Daemon->new(LocalPort => 8080);
->dispatch({'/jsonrpc/API' => 'MyApp'})
->handle();
#--------------------------
# In your application class
package MyApp;
use base qw(JSON::RPC::Procedure); # Perl 5.6 or more than
sub echo : Public { # new version style. called by clients
# first argument is JSON::RPC::Server object.
return $_[1];
}
sub sum : Public(a:num, b:num) { # sets value into object member a, b.
my ($s, $obj) = @_;
# return a scalar value or a hashref or an arryaref.
return $obj->{a} + $obj->{b};
}
sub a_private_method : Private {
# ... can't be called by client
}
sub sum_old_style { # old version style. taken as Public
my ($s, @arg) = @_;
return $arg[0] + $arg[1];
}
DESCRIPTION
This module is for http daemon servers using HTTP::Daemon or HTTP::Daemon::SSL.
METHODS
They are inherited from the JSON::RPC::Server methods basically. The below methods are implemented in JSON::RPC::Server::Daemon.
new Creates new JSON::RPC::Server::Daemon object. Arguments are passed to HTTP::Daemon or HTTP::Daemon::SSL.
handle
Runs server object and returns a response.
retrieve_json_from_post
retrieves a JSON request from the body in POST method.
retrieve_json_from_get
In the protocol v1.1, 'GET' request method is also allowable. it retrieves a JSON request from the query string in GET method.
response
returns a response JSON data to a client.
SEE ALSO
HTTP::Daemon,
HTTP::Daemon::SSL,
JSON::RPC::Server,
JSON::RPC::Procedure,
JSON,
<http://json-rpc.org/wd/JSON-RPC-1-1-WD-20060807.html>,
<http://json-rpc.org/wiki/specification>,
AUTHOR
Makamaka Hannyaharamitu, <makamaka[at]cpan.org>
COPYRIGHT AND LICENSE
Copyright 2007-2008 by Makamaka Hannyaharamitu
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.10.1 2008-09-01 JSON::RPC::Server::Daemon(3pm)
01-16-2020
