Hi There, I was trying to create a flow that simulates who | wc -l (from this question ) but I realised that it's not that simple... What I wanted to do was connect to exec nodes together, one doing the who and the other doing the wc -l: [Screenshot 2024-09-13 at 07.41.45] what happens is that t…

[image] jbudd: execute a script entirely within Node-red, You're using the append option that takes the payload and adds it to the command line for the command. That does not work in my python example above. I can't (or at least in the 30secs I tried) take a template with python code and pass…

[image] gregorius: Do you provide a command via the msg object? I pass the entire script as msg.payload. I assume that the exec node concatenates the command, msg.payload (if ticked) and extra parameters before it invokes bash to run the requested command, thus it does not care if the "comma…

Meanwhile - back on the main thread... (unless it has now been abandoned...) The UI to declutter is this [image] maybe append msg. xxx as [parameter]/[stdin] <-- select other ideas ???

[image] dceejay: (unless it has now been abandoned...) Hmm. I apologise.

[image] dceejay: [parameter]/[stdin] <-- select you mean a dropdown since these two options are mutually exclusive? Sounds good to me - I'll give a whirl on the old FJ in a sec.

[image] jbudd: Hmm. I apologise. All good with me, no apology needed :+1:

Yes - exactly that - with default being parameter (as today) of course.

indeed - no need to apologise - but feel free to fork another discussion referencing back.

Ok the UI is now this: [execwithpipe] The code for the node is over at FlowHub (with an explanation on how to install the node locally) with an example flow and for those interested in how I did this, the blog post with screencast . Btw, it's much less code doing it this way, thanks for the sugges…

Exec node - piping payload to stdin for commands

General

gregorius 13 September 2024 12:43 21

Screenshot 2024-09-13 at 14.42.18

So that's what it would look like - I still have to do the server code to support the new option.

EDIT: and also the logic to deactivate the dropdown if append isn't checked

1 Like

Topic		Replies	Views
Bash code and data within Node-red General feature-request	20	533	8 April 2023
Exec node send an output payload on more than one message General exec	34	686	3 February 2023
Exec node with async execution as well as stdin capability Feature Requests	20	626	3 June 2023
Exec-Node: Works fine in Linux Terminal, but not in Exec-Node General exec	46	472	19 February 2025
Exec node - help with how it spawns General	15	470	13 March 2025

Exec node - piping payload to stdin for commands

Related topics