In /usr/bin/unicode_stop line 9:
TTY="`/usr/bin/tty`"
     ^------------^ SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
TTY="$(/usr/bin/tty)"


In /usr/bin/unicode_stop line 26:
uid="`id -u 2>/dev/null`" ||:
     ^-----------------^ SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
uid="$(id -u 2>/dev/null)" ||:

For more information:
  https://www.shellcheck.net/wiki/SC2006 -- Use $(...) notation instead of le...