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diff --git a/Functions/allopt b/Functions/allopt
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+# This function lists options with the no's in front removed for
+# improved comprehension, i.e. `norcs off' becomes `rcs on'.
+# The format is otherwise like that with `kshoptionprint' set,
+# i.e. you can see all options whether on or off.
+# It can take a list of option names or parts thereof to search for
+# via egrep.
+#
+# Written by Sweth Chandramouli with hacks by Bart Schaefer.
+
+listalloptions () {
+   emulate -R zsh
+   builtin setopt localoptions kshoptionprint
+   local OPT_NAME OPT_PAIR OPT_VALUE
+   for OPT_PAIR in "${(f)$(builtin setopt)}" ; do
+      OPT_VALUE=${OPT_PAIR##* }
+      OPT_NAME=${OPT_PAIR%% *}
+      if [[ ${OPT_NAME#no} != ${OPT_NAME} ]] ; then
+         OPT_VALUE=${(L)${${OPT_VALUE:s/on/OFF}:s/off/on}} &&
+            OPT_NAME=${OPT_NAME#no};
+      fi;
+      echo ${(r:21:)OPT_NAME} ${OPT_VALUE}
+   done
+}
+
+if [[ -n $@ ]]; then
+    listalloptions | egrep "${(j.|.)@}"
+else
+    listalloptions
+fi