In /usr/bin/ltnu line 8:
if [ "${1}" = '-h' -o "${1}" = '--help' ]; then
                   ^-- SC2166: Prefer [ p ] || [ q ] as [ p -o q ] is not well defined.


In /usr/bin/ltnu line 45:
    if echo "${1}" | fgrep -q @; then
                     ^---^ SC2197: fgrep is non-standard and deprecated. Use grep -F instead.


In /usr/bin/ltnu line 65:
if [ -z "${PAGER}" -o "${PAGER}" = "less" ]; then
                   ^-- SC2166: Prefer [ p ] || [ q ] as [ p -o q ] is not well defined.

For more information:
  https://www.shellcheck.net/wiki/SC2166 -- Prefer [ p ] || [ q ] as [ p -o q...
  https://www.shellcheck.net/wiki/SC2197 -- fgrep is non-standard and depreca...