Didn’t work again with the raw/endraw tags… I even tried something that must have worked for that poster here and same results after changing the shell_command to: dtv_channel: '/bin/echo {{ip}} > ~/jz.txt’
However, then changing the command to the following always executes correctly with my trigger and I can see jz.txt created every time: dtv_channel: '/bin/echo test > ~/jz.txt’
Frustrating 
I’m thinking of opening a GitHub bug on this. Can somebody please confirm that they’re successfully using passed parameters to shell_command and on the current version of HA?
Have a wonderful weekend!