+continue to the end of the line. Each command line argument is considered\n\
+to be a separate line.\n\
+\n\
+The grammar is fairly complicated. For a summary, run `$ --grammar'.\n\
+For a summary of the various options, run `$ --options'.\n\
+");
+}
+
+/* --- Other helpful options --- */
+
+static void grammar(FILE *fp)
+{
+ version(fp);
+ pquis(fp, "\n\
+Grammar summary\n\
+\n\
+Basic syntax\n\
+ file ::= empty | file stmt [`;']\n\
+ stmt ::= option-stmt | fw-stmt\n\
+ fw-stmt ::= `fw' source options [`to'|`->'] target options\n\
+ options ::= `{' option-seq `}'\n\
+ option-seq ::= empty | option-stmt [`;'] option-seq\n\
+\n\
+Option syntax\n\
+ option-stmt ::= q-option\n\
+ q-option ::= option\n\
+ | prefix `.' q-option\n\
+ | prefix `{' option-seq `}'\n\
+ prefix ::= word\n\
+\n\
+File source and target\n\
+ source ::= file\n\
+ target ::= file\n\
+ file ::= `file' [`.'] fspec [`,' fspec]\n\
+ fspec ::= fd-spec | name-spec | null-spec\n\
+ fd-spec ::= [[`:']`fd'[`:']] number|`stdin'|`stdout'\n\
+ name-spec ::= [[`:']`file'[`:']] file-name\n\
+ file-name ::= path-seq | [ path-seq ]\n\
+ path-seq ::= path-elt | path-seq path-elt\n\
+ path-elt ::= `/' | word\n\
+ null-spec ::= [`:']`null'[`:']\n\
+\n\
+Exec source and target\n\
+ source ::= exec\n\
+ target ::= exec\n\
+ exec ::= `exec' [`.'] cmd-spec\n\
+ cmd-spec ::= shell-cmd | [prog-name] `[' argv0 arg-seq `]'\n\
+ arg-seq ::= word | arg-seq word\n\
+ shell-cmd ::= word\n\
+ argv0 ::= word\n\
+\n\
+Socket source and target\n\
+ source ::= socket-source\n\
+ target ::= socket-target\n\
+ socket-source ::= [`socket'[`.']] [[`:']addr-type[`:']] source-addr\n\
+ socket-target ::= [`socket'[`.']] [[`:']addr-type[`:']] target-addr\n\
+\n\
+ inet-source-addr ::= [port] port\n\
+ inet-target-addr ::= address [`:'] port\n\
+ address ::= addr-elt | address addr-elt\n\
+ addr-elt ::= `.' | word\n\
+\n\
+ unix-source-addr ::= file-name\n\
+ unix-target-addr ::= file-name\n\
+");
+}
+
+static void options(FILE *fp)
+{
+ version(fp);
+ pquis(fp, "\n\
+Options summary\n\
+\n\
+File attributes (`fattr')\n\
+ prefix.fattr.mode [=] mode\n\
+ prefix.fattr.owner [=] user\n\
+ prefix.fattr.group [=] group\n\
+\n\
+File options\n\
+ file.create [=] yes|no\n\
+ file.open [=] no|truncate|append\n\
+ file.fattr.*\n\
+\n\
+Exec options\n\
+ exec.logging [=] yes|no\n\
+ exec.dir [=] file-name\n\
+ exec.root [=] file-name\n\
+ exec.user [=] user\n\
+ exec.group [=] group\n\
+ exec.rlimit.limit[.hard|.soft] [=] value\n\
+ exec.env.clear\n\
+ exec.env.unset var\n\
+ exec.env.[set] var [=] value\n\
+\n\
+Socket options\n\
+ socket.conn [=] number|unlimited|one-shot\n\
+ socket.logging [=] yes|no\n\
+ socket.inet.[allow|deny] [from] address [/ address]\n\
+ socket.unix.fattr.*\n\
+");