John, LINES and COLUMNS are shell variables, not environment variables. They don't get exported to child processes. That's why your code won't work that way.
You can use tput and put the output into a temporary file, and then open it and read the answer into a variable for use in your code. The easiest thing to do is to leverage the kernel API for returning the output of shell commands in your mumps code. Here is your code reworked with my example:
Code:
;;PDOC
;;SUMMARY Get terminal height in lines
;;DEFFNC
TRMLINES()
;;PDOC/
Q $$RETURN^%ZOSV("tput lines")
;;PDOC
;;SUMMARY Get terminal width in columns
;;DEFFNC
TRMCOLS()
;;PDOC/
Q $$RETURN^%ZOSV("tput cols")
;;SUMMARY Get terminal height in lines
;;DEFFNC
TRMLINES()
;;PDOC/
Q $$RETURN^%ZOSV("tput lines")
;;PDOC
;;SUMMARY Get terminal width in columns
;;DEFFNC
TRMCOLS()
;;PDOC/
Q $$RETURN^%ZOSV("tput cols")
I hope this helps you John.
