In /usr/bin/itpp-config line 30:
  exit $1
       ^-- SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
  exit "$1"


In /usr/bin/itpp-config line 39:
  -*=*) optarg=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
               ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
  -*=*) optarg=$(echo "$1" | sed 's/[-_a-zA-Z0-9]*=//') ;;


In /usr/bin/itpp-config line 40:
  *) optarg= ;;
     ^----^ SC2034: optarg appears unused. Verify use (or export if used externally).

For more information:
  https://www.shellcheck.net/wiki/SC2034 -- optarg appears unused. Verify use...
  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...
  https://www.shellcheck.net/wiki/SC2006 -- Use $(...) notation instead of le...