The whiptail command has a --textbox option
A text box lets you display the contents of a text file in a dialog box
I would like to use the output of a command in its place (yup, that's the same question posted here), but the difference is that when I run the command in the response (not the same) whiptail --textbox /dev/stdin 30 60 <<< "$(echo Hello)" I get an empty textbox as you can see here.
Which other ways could you handle the output of a command as a file?
Thank you!
It turns out that cmd | whiptail --textbox /dev/stdin 30 60 doesn't work for you because you're using Bash v5.1, not because of any changes in whiptail.
You can still use this alternative workaround:
whiptail --scrolltext --msgbox "$(cmd)" 30 60
provided the output of cmd is not too big to include in the command line (around 128kb).
I rewrote the original question which you cited, taking into account the change in Bash v5.1 and a more accurate analysis of the original problem, so I'm not going to repeat all of that here.