No bash, se você quiser excluir esses padrões, pode usar a correspondência estendida de padrões:
# optional - save extglob state
$ shopt -q extglob && extglob_disabled=false || extglob_disabled=true
# enable extended pattern matching
$ shopt -s extglob
$ addons="WEBIF_LIVELOG WEBIF_JQUERY TOUCH WITH_SSL READ_SDT_CHARSETS WITH_DEBUG MODULE_MONITOR"
$ echo ${addons//@(WEBIF_|WITH_|MODULE_|HAVE_|_CHARSETS)}
LIVELOG JQUERY TOUCH SSL READ_SDT DEBUG MONITOR
# optional - restore extglob state
$ $extglob_disabled && shopt -u extglob