In /usr/bin/gdbtui line 3:
prog=$(basename $0 tui)
                ^-- SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
prog=$(basename "$0" tui)


In /usr/bin/gdbtui line 5:
dir=$(dirname $0)
              ^-- SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
dir=$(dirname "$0")


In /usr/bin/gdbtui line 10:
exec $prog --tui "$@"
     ^---^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
exec "$prog" --tui "$@"

For more information:
  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...