{"id":8263,"date":"2020-10-11T14:35:07","date_gmt":"2020-10-11T12:35:07","guid":{"rendered":"https:\/\/www.nerdiy.de\/?p=8263"},"modified":"2021-12-18T17:23:22","modified_gmt":"2021-12-18T16:23:22","slug":"show-nodered-linux-login-history","status":"publish","type":"post","link":"https:\/\/nerdiy.de\/en\/show-nodered-linux-login-history\/","title":{"rendered":"HowTo: Node Red \u2013 Show Linux login history"},"content":{"rendered":"
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It is now known that almost all Linux commands can be executed using NodeRed. What makes the whole thing particularly practical is that you can then process the returned data using NodeRed.<\/p>\n\n\n\n

This allows the read data to be processed. In the following article I use this to read out the last Linux logins on my RaspberryPi and display them in a table. This allows you to clearly display the last logins and show who logged in from where and when on the Linux computer in question. \ud83d\ude42<\/p>\n\n\n\n

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Safety instructions <\/span><\/h2>\r\n

I know the following notes are always kind of annoying and seem unnecessary. Unfortunately, many people who knew "better" have lost eyes, fingers or other things due to carelessness or injured themselves. Data loss is almost negligible in comparison, but even these can be really annoying. Therefore, please take five minutes to read the safety instructions. Because even the coolest project is not worth injury or other trouble.<\/span>
https:\/\/www.nerdiy.de\/sicherheitshinweise\/<\/span><\/a><\/em><\/strong><\/p>\r\n

Affiliate links\/advertising links<\/h2>\r\n

The links to online shops listed here are so-called affiliate links. If you click on such an affiliate link and make a purchase via this link, Nerdiy.de will receive a commission from the relevant online shop or provider. The price does not change for you. If you make your purchases via these links, you support Nerdiy.de in being able to offer other useful projects in the future. \ud83d\ude42\u00a0<\/em><\/p>\n\n\n\n

\n\n\n\n

Requirements<\/h2>\n\n\n\n

Helpful articles:
<\/strong>So that you can install new nodes, NodeRed should of course already be installed.
How to prepare a RaspberryPi and then install NodeRed on it is described in the following articles.<\/p>\n\n\n\n

The following three articles describe what needs to be done to prepare the RaspberryPi:
RaspberryPi \u2013 setup for nerdiys!<\/a><\/em><\/strong>
RaspberryPi \u2013 The first configuration!
<\/a>RaspberryPi \u2013 Control the RaspberryPi via SSH<\/a><\/em><\/strong>
NodeRed \u2013 Installing NodeRed on the RaspberryPi<\/em><\/strong><\/a><\/p>\n\n\n\n

Required tool:
<\/strong>-no-<\/p>\n\n\n\n

Required material:<\/strong><\/p>\n\n\n\n

In the following list you will find all the parts you need to implement this article.<\/strong> <\/p>\n\n\n\n

\n \n \n \n \n \n \n \n \n <\/colgroup>\n <\/table>\n \n \n \n<\/div>\n\n\n\n\n
\n\n\n

Log into the NodeRed configuration interface<\/h2>\r\n

Before you can edit your NodeRed configuration, you must - if activated - first log into the NodeRed configuration interface.<\/p>\r\n

\"\"<\/a>
View of the login dialog. Here you have to enter the login data that you specified during the configuration of the login. You can find information about this in the article NodeRed - set up user login<\/strong><\/em><\/a>.<\/figcaption><\/figure>\n\n\n\n
\n\n\n\n

Install required nodes<\/h2>\n\n\n\n

In order for you to be able to use the NodeCode below, you must also have the Dashboard node (NodeRed - Create a user interface with dashboard nodes<\/em><\/strong><\/a>) also the node<\/p>\n\n\n\n

node-red-node-ui-table<\/pre>\n\n\n\n
to install.<\/p>\n\n\n\n
How you can do this is in the article NodeRed \u2013 Install new nodes<\/a><\/em><\/strong> described.<\/p>\n\n\n\n
\n\n\n\n
Import node code<\/h2>\n\n\n\n
To test this code you can simply import the code below into your NodeRed installation. You can find tips on this in the article NodeRed - import and export node code<\/strong><\/em><\/a>.<\/p>\n\n\n\n
\"\"<\/a>
View of the NodeRed flow in the NodeRed configuration view.<\/figcaption><\/figure>\n\n\n\n
Unfortunately, I couldn't insert the NodeCode directly here because the HTML code it contains somewhat \u201cconfuses\u201d the look of the website.<\/p>\n\n\n\n
You can therefore find the NodeCode here Nerdiy Git<\/strong><\/em><\/a>:<\/p>\n\n\n\n
https:\/\/github.com\/Nerdiyde\/NodeRedSnippets\/blob\/master\/Display%20last%20Linux%20logins.txt<\/a><\/em><\/strong><\/p>\n\n\n\n
\n\n\n\n
Dashboard view<\/h2>\n\n\n\n
\"\"<\/a>
Here you can see the table with the list of the last Linux logins.<\/figcaption><\/figure>\n\n\n\n
\n\n\n
Have fun with the project<\/h2>\r\n
I hope everything worked as described for you. If not or you have questions or suggestions please let me know in the comments. I will then add this to the article if necessary.
Ideas for new projects are always welcome. \ud83d\ude42<\/p>\r\n
PS Many of these projects - especially the hardware projects - cost a lot of time and money. Of course I do this because I enjoy it, but if you think it's cool that I share the information with you, I would be happy about a small donation to the coffee fund. \ud83d\ude42<\/strong><\/p>\r\n
\"Buy<\/a>\u00a0 \u00a0 \u00a0 \u00a0   \"\"<\/p>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"
That with the help of NodeRed almost all Linux commands can be executed is known by now. 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