Running install-service.sh on LibreELEC 5.10.95 produces syntax errors

[williamlugg]

I'm attempting to install the fanshim on a RPI running LibreELEC v5.10.95. When I run the install-service.sh file via ssh it fails reporting a syntax error at line 4: bad substitution and a syntax error on line 9: unexpected "(". After some tinkering I discovered the line 4 error is actually on line 3.

FWIW, I also tried the Kodi fanshim tool by jane_t from the github repository, but it doesn't seem to turn the fan on...but that's a separate issue.