Unable to get command module to display results

[k5map]

I generated the config JSON file via "fastfetch --gen-config". I then added the following in the modules section after the seperator:
{
"type": "command",
"shell": "/bin/sh",
"text": "cat /sys/firmware/devicetree/base/serial-number",
"key": "S-N"
},

When I run fastfetch nothing is displayed. Is there a problem with my command section?

[CarterLi]

please try

{
"type": "host",
"format": "{serial}",
"key": "S-N"
},

[k5map]

@CarterLi ... When I enter what you provided, I get a blank response on the line after Host.

[CarterLi]

Does cat /sys/firmware/devicetree/base/serial-number without sudo work?

[k5map]

Yes... I can type this as a user on a RPi and it returns a string. But I believe the string is not null terminated because the command prompt is shown next to the output.

[k5map]

@CarterLi ... I owe you a BIG apology.

I wasn't paying attention to where I was running fastfetch because I installed it on one of my Pi virtual machine. So, no wonder it will not output a serial number :)