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Top Forums Shell Programming and Scripting How to define a variable in a BASH script by using a JSON file online? Post 302869177 by nbsparks on Tuesday 29th of October 2013 05:47:52 PM
Old 10-29-2013
How to define a variable in a BASH script by using a JSON file online?

Hello,

I would like to modify an existing script of mine that uses a manually defined "MCVERSION" variable and make it define that variable instead based on this JSON file stored online:
https://s3.amazonaws.com/Minecraft.D.../versions.json

Within that JSON, I 'm looking for this information:
Code:
{
  "latest": {
    "snapshot": "1.7.2",
    "release": "1.7.2"
  },

I want $MCVERSION to equal the "latest/release" value above (in this case, MCVERSION=1.7.2). I'm perfectly OK with pulling the JSON file down locally first via "wget" command. In fact, I'd prefer that so I can reference it if needed if my script fails (in case they change their JSON file format).

Here is my script (not that it matters too much for this example, I doubt).
Code:
#!/bin/bash

#### Define the current version of Minecraft
MCVERSION=1.7.2

#### Remove any current versions and create new folder for the JAR file
cd /home/mcmaps/.minecraft/versions
rm * -rf
mkdir $MCVERSION
cd /home/mcmaps/.minecraft/versions/$MCVERSION/

#### Download fresh copy of Minecraft JAR file for use of textures
wget https://s3.amazonaws.com/Minecraft.Download/versions/$MCVERSION/$MCVERSION.jar -P ~/.minecraft/versions/$MCVERSION/

Currently, the script results in creating this file:
/home/mcmaps/.minecraft/versions/1.7.2/1.7.2.jar

The goal is to do that without ever having to manually modify the MCVERSION variable in this script.
 

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Template::Plugin::JSON::Escape(3pm)			User Contributed Perl Documentation		       Template::Plugin::JSON::Escape(3pm)

NAME
Template::Plugin::JSON::Escape - Adds a .json vmethod and a json filter. SYNOPSIS
[% USE JSON.Escape( pretty => 1 ) %]; <script type="text/javascript"> var foo = [% foo.json %]; var bar = [% json_string | json %] </script> or read in JSON [% USE JSON.Escape %] [% data = JSON.Escape.json_decode(json) %] [% data.thing %] DESCRIPTION
This plugin allows you to embed JSON strings in HTML. In the output, special characters such as "<" and "&" are escaped as "uxxxx" to prevent XSS attacks. It also provides decoding function to keep compatibility with Template::Plugin::JSON. FEATURES
USE JSON.Escape Any options on the USE line are passed through to the JSON object, much like "to_json" in JSON. json vmethod A ".json" vmethod converts scalars, arrays and hashes into corresponding JSON strings. [% json_stuct = { foo => 42, bar => [ 1, 2, 3 ] } %] <script> var json = [% json_struct.json %]; </script> <span onclick="doSomething([% json_struct.json %]);"> json filter A "json" filter escapes "<", ">", "&", "+", "U+2028" and "U+2029" as "uxxxx". In the attribute, you may just use an "html" filter. [% json_string = '{ "foo": 42, "bar": [ 1, 2, 3 ] }' %] <script> var json = [% json_string | json %]; </script> <span onclick="doSomething([% json_string | html %]);"> json_decode method A "json_decode" method allow you to convert from a JSON string into a corresponding data structure. [% SET json_struct = JSON.Escape.json_decode(json_string) %] [% json_struct.foo | html %] SEE ALSO
Template::Plugin::JSON, JSON, Template::Plugin VERSION CONTROL
https://github.com/nanto/perl-Template-Plugin-JSON-Escape <https://github.com/nanto/perl-Template-Plugin-JSON-Escape> AUTHOR
nanto_vi (TOYAMA Nao) <nanto@moon.email.ne.jp> COPYRIGHT &; LICENSE Copyright (c) 2011 nanto_vi (TOYAMA Nao). Copyright (c) 2006, 2008 Infinity Interactive, Yuval Kogman. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. perl v5.14.2 2011-06-13 Template::Plugin::JSON::Escape(3pm)
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