In /usr/bin/lb line 14:
[ -e "${LIVE_BUILD}/scripts/build.sh" ] && . "${LIVE_BUILD}/scripts/build.sh" || . /usr/lib/live/build.sh
                                        ^-- SC2015: Note that A && B || C is not if-then-else. C may run when A is true.
                                             ^-- SC1090: Can't follow non-constant source. Use a directive to specify location.
                                                                                   ^--------------------^ SC1091: Not following: /usr/lib/live/build.sh was not specified as input (see shellcheck -x).


In /usr/bin/lb line 17:
DESCRIPTION="$(Echo 'utility to build live systems')"
^---------^ SC2034: DESCRIPTION appears unused. Verify use (or export if used externally).


In /usr/bin/lb line 18:
HELP="FIXME"
^--^ SC2034: HELP appears unused. Verify use (or export if used externally).


In /usr/bin/lb line 19:
USAGE="FIXME"
^---^ SC2034: USAGE appears unused. Verify use (or export if used externally).


In /usr/bin/lb line 74:
		elif [ -x /usr/lib/live/build/${COMMAND} ]
                                              ^--------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
		elif [ -x /usr/lib/live/build/"${COMMAND}" ]


In /usr/bin/lb line 78:
		elif [ -x "$(which ${COMMAND} 2>/dev/null)" ]
                                   ^--------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
		elif [ -x "$(which "${COMMAND}" 2>/dev/null)" ]


In /usr/bin/lb line 87:
		Echo "[%s] %s" "$(date +'%F %T')" "lb ${COMMAND} $(echo ${@})"
                                                                 ^----------^ SC2116: Useless echo? Instead of 'cmd $(echo foo)', just use 'cmd foo'.
                                                                        ^--^ SC2068: Double quote array expansions to avoid re-splitting elements.

For more information:
  https://www.shellcheck.net/wiki/SC2068 -- Double quote array expansions to ...
  https://www.shellcheck.net/wiki/SC1090 -- Can't follow non-constant source....
  https://www.shellcheck.net/wiki/SC2034 -- DESCRIPTION appears unused. Verif...