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.
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Discussion started by: manas_ranjan
4 Replies
LEARN ABOUT DEBIAN
rdf::trine::iterator::graph
RDF::Trine::Iterator::Graph(3pm) User Contributed Perl Documentation RDF::Trine::Iterator::Graph(3pm)NAME
RDF::Trine::Iterator::Graph - Iterator class for graph query results
VERSION
This document describes RDF::Trine::Iterator::Graph version 1.000
SYNOPSIS
use RDF::Trine::Iterator::Graph;
my $iterator = RDF::Trine::Iterator::Graph->new( &data );
while (my $st = $iterator->next) {
# $st is a RDF::Trine::Statement object
print $st->as_string;
}
METHODS
Beyond the methods documented below, this class inherits methods from the RDF::Trine::Iterator class.
"new ( @results, %args )"
"new ( &results, %args )"
Returns a new SPARQL Result interator object. Results must be either an reference to an array containing results or a CODE reference
that acts as an iterator, returning successive items when called, and returning undef when the iterator is exhausted.
$type should be one of: bindings, boolean, graph.
"as_bindings ( $s, $p, $o )"
Returns the iterator as a Bindings iterator, using the supplied triple nodes to determine the variable bindings.
"materialize"
Returns a materialized version of the current graph iterator. The materialization process will leave this iterator empty. The
materialized iterator that is returned should be used for any future need for the iterator's data.
"unique"
Returns a Graph iterator that ensures the returned statements are unique. While the underlying RDF graph is the same regardless of
uniqueness, the iterator's serialization methods assume the results are unique, and so use this method before serialization.
Uniqueness is opt-in for efficiency concerns -- this method requires O(n) memory, and so may have noticeable effects on large graphs.
"is_graph"
Returns true if the underlying result is an RDF graph.
"as_string ( $max_size [, $count] )"
Returns a string table serialization of the stream data.
"as_xml ( $max_size )"
Returns an XML serialization of the stream data.
"print_xml ( $fh, $max_size )"
Prints an XML serialization of the stream data to the filehandle $fh.
"as_json ( $max_size )"
Returns a JSON serialization of the stream data.
"as_hashref"
Returns a hashref representing the model in an RDF/JSON-like manner.
See "as_hashref" at RDF::Trine::Model for full documentation of the hashref format.
"construct_args"
Returns the arguments necessary to pass to the stream constructor _new to re-create this stream (assuming the same closure as the first
DEPENDENCIES
JSON
Scalar::Util
BUGS
Please report any bugs or feature requests to through the GitHub web interface at <https://github.com/kasei/perlrdf/issues>.
AUTHOR
Gregory Todd Williams "<gwilliams@cpan.org>"
COPYRIGHT
Copyright (c) 2006-2012 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms
as Perl itself.
perl v5.14.2 2012-06-29 RDF::Trine::Iterator::Graph(3pm)