# Appendix: Resource Indexes

This appendix list resources by envariables, resource file elements, and command-line options.

- Environment Variables
- Resource Elements
- Command-Line Options

## Environment Variables

Envariable | Description
`M2H_ADDRESSMODIFYCODE` | Perl expressions modifying displayed addresses in headers.
`M2H_AFS` | Skip archive directory permission check.
`M2H_ANNOTATE` | Add/set annotation for message(s).
`M2H_ARCHIVE` | Create archive.
`M2H_AUTHSORT` | Sort main index by author.
`M2H_CHECKNOARCHIVE` | Honor "no archive" flag in messages.
`M2H_CONLEN` | Use Content-Length value.
`M2H_DATEFIELDS` | List of fields to extract date of message.
`M2H_DBFILE` | Name of archive database file.
`M2H_DBFILEPERMS` | File permissions for DBFILE.
`M2H_DECODEHEADS` | Store "decode-only" characters sets in raw form.
`M2H_DEFRCFILE` | Pathname of default resource file.
`M2H_DEFRCNAME` | Name of default resource file.
`M2H_DOC` | Add link to documentation.
`M2H_DOCURL` | URL to documentation
`M2H_EXPIREAGE` | Length of time to keep a message in an archive.
`M2H_EXPIREDATE` | Expiration of date of message.
`M2H_FASTTEMPFILES` | Use non-random temporary filenames.
`M2H_FILEPERMS` | File permissions for archive files.
`M2H_FOLREFS` | Print links links to explicit follow-ups and references.
`M2H_FROMFIELDS` | List of fields to extract author of a message.
`M2H_GMTDATEFMT` | Conversion specification for GMT dates.
`M2H_GZIPEXE` | Pathname to gzip executable.
`M2H_GZIPFILES` | Gzip files.
`M2H_GZIPLINKS` | Assume files are gzipped when creating links.
`M2H_HTMLEXT` | Extension to use for HTML files.
`M2H_ICONURLPREFIX` | Prefix for icon URLs.
`M2H_IDXFNAME` | Filename for main (first) index page.
`M2H_IDXPREFIX` | Filename prefix for multi-page main index.
`M2H_IDXSIZE` | Size of each index page.
`M2H_LOCALDATEFMT` | Conversion specification for printing local date.
`M2H_LOCKDELAY` | Wait time between lock attempts.
`M2H_LOCKFILE` | Name of the lock file.
`M2H_LOCKMETHOD` | How archive locks are done.
`M2H_LOCKTRIES` | Total number of time to attempt a lock before failing.
`M2H_MAILTO` | Convert email addresses in message headers to hyperlinks.
`M2H_MAILTOURL` | URL template to use when MAILTO is set.
`M2H_MAIN` | Create main index.
`M2H_MAXSIZE` | Maximum number of messages in an archive.
`M2H_MHPATTERN` | Regex for matching message files in an MH folder (directory).
`M2H_MODIFYBODYADDRESSES` | Apply ADDRESSMODIFYCODE to text message bodies.
`M2H_MODTIME` | Set modification time on message files to message dates.
`M2H_MONTHS` | Month names.
`M2H_MONTHSABR` | Abbreviated month names.
`M2H_MSGEXCFILTER` | Perl expression(s) to selectively exclude messages.
`M2H_MSGGMTDATEFMT` | GMT conversion specification for message dates.
`M2H_MSGLOCALDATEFMT` | Local conversion specification for message dates.
`M2H_MSGPGS` | Print message pages.
`M2H_MSGPREFIX` | Prefix for message page filenames.
`M2H_MSGSEP` | Regex for matching message separator in mailbox files.
`M2H_MULTIPG` | Create multi-page indexes.
`M2H_NEWS` | Hyperlink newsgroups in message headers.
`M2H_NOSUBJECTTXT` | Raw subject text to use for messages without a subject.
`M2H_NOTEDIR` | Directory to store annotations.
`M2H_OTHERINDEXES` | List of alternate indexes to create for an archive.
`M2H_OUTDIR` | Location of archive.
`M2H_PERLINC` | Additional Perl include paths.
`M2H_POSIXSTRFTIME` | Use POSIX's strftime() for converted time format strings.
`M2H_RCFILE` | Resource file to read before processing input.
`M2H_REVERSE` | Reverse the listing order in the main index.
`M2H_SAVERESOURCES` | Save resource values in database.
`M2H_SORT` | List messages by date in main index.
`M2H_SPAMMODE` | Perform actions to deter email address harvesters.
`M2H_SUBJECTARTICLERXP` | Regex for matching leading articles in message subjects.
`M2H_SUBJECTREPLYRXP` | Regex for matching subject text denoting a reply message.
`M2H_SUBJECTSTRIPCODE` | Perl expressions to strip subject text while reading messages.
`M2H_SUBJECTTHREADS` | Check subjects when computing message threads.
`M2H_SUBSORT` | List messages by subjext in main index.
`M2H_THREAD` | Create thread index.
`M2H_TIDXFNAME` | Filename of first thread index page.
`M2H_TIDXPREFIX` | Filename prefix for thread index pages beyond the first page.
`M2H_TITLE` | Title for main index.
`M2H_TLEVELS` | Maximum number of levels to indent in thread index.
`M2H_TREVERSE` | List thread in reverse order.
`M2H_TSLICE` | Size of thread listing slice for message pages.
`M2H_TSLICELEVELS` | Maximum number of levels to indent in thread slices.
`M2H_TSORT` | List threads by date.
`M2H_TSUBSORT` | List threads by subject.
`M2H_TTITLE` | Title of thread index.
`M2H_UMASK` | Umask value for the MHonArc process.
`M2H_USELOCALTIME` | Use local time to determine day groups in main index listing.
`M2H_USINGLASTPG` | $LASTPG$ is used in resource values.
`M2H_VARREGEX` | Perl regular expression matching a resource variable.
`M2H_WEEKDAYS` | Weekday names.
`M2H_WEEKDAYSABR` | Abbreviated weekday names.

## Resource Elements

Element | Description
`<ADDRESSMODIFYCODE>` | Perl expressions modifying displayed addresses in headers.
`<AUTHORBEGIN>` | Markup at the start of a author group.
`<AUTHOREND>` | Markup at the end of a author group.
`<AUTHSORT>` `<NOAUTHSORT>` | Sort main index by author.
`<BOTLINKS>` | Links markup at the bottom of message pages.
`<CHARSETALIASES>` | Charater set aliases.
`<CHARSETCONVERTERS>` | Charater set filter functions.
`<CHECKNOARCHIVE>` `<NOCHECKNOARCHIVE>` | Honor "no archive" flag in messages.
`<CONLEN>` `<NOCONLEN>` | Use Content-Length value.
`<DATEFIELDS>` | List of fields to extract date of message.
`<DAYBEGIN>` | Markup at the start of a day group.
`<DAYEND>` | Markup at the end of a day group.
`<DBFILEPERMS>` | File permissions for DBFILE.
`<DECODEHEADS>` `<NODECODEHEADS>` | Store "decode-only" characters sets in raw form.
`<DEFCHARSET>` | Default character set for text data.
`<DEFINEDERIVED>` | Define extra file(s) to generate for each message page.
`<DEFINEVAR>` | Define a custom resource variable.
`<DOC>` `<NODOC>` | Add link to documentation.
`<DOCURL>` | URL to documentation
`<EXCS>` | List of header fields to exclude.
`<EXPIREAGE>` | Length of time to keep a message in an archive.
`<EXPIREDATE>` | Expiration of date of message.
`<FASTTEMPFILES>` `<NOFASTTEMPFILES>` | Use non-random temporary filenames.
`<FIELDORDER>` | Order to display message header fields.
`<FIELDSBEG>` | Beginning markup of message header.
`<FIELDSEND>` | Ending markup of message header.
`<FIELDSTORE>` | Message header fields to store in database.
`<FIELDSTYLES>` | Define HTML elements that wrap field text of message headers.
`<FILEPERMS>` | File permissions for archive files.
`<FIRSTPGLINK>` | Link markup for first page of main index.
`<FLDBEG>` | Markup before field text.
`<FLDEND>` | Markup after field text.
`<FOLREFS>` `<NOFOLREFS>` | Print links links to explicit follow-ups and references.
`<FOLUPBEGIN>` | Beginning markup of follow-up links in message pages.
`<FOLUPEND>` | Ending markup of follow-up links in message pages.
`<FOLUPLITXT>` | Markup for a follow-up link.
`<FROMFIELDS>` | List of fields to extract author of a message.
`<GMTDATEFMT>` | Conversion specification for GMT dates.
`<GZIPEXE>` | Pathname to gzip executable.
`<GZIPFILES>` `<NOGZIPFILES>` | Gzip files.
`<GZIPLINKS>` `<NOGZIPLINKS>` | Assume files are gzipped when creating links.
`<HEADBODYSEP>` | Markup separating the message head from the body.
`<HTMLEXT>` | Extension to use for HTML files.
`<ICONS>` | Content-type to icon mapping.
`<ICONURLPREFIX>` | Prefix for icon URLs.
`<IDXFNAME>` | Filename for main (first) index page.
`<IDXLABEL>` | Label for main index.
`<IDXPGBEGIN>` | Beginning markup for main index pages.
`<IDXPGEND>` | Ending markup for main index pages.
`<IDXPGSSMARKUP>` | Markup at the beginning of all index pages.
`<IDXPREFIX>` | Filename prefix for multi-page main index.
`<IDXSIZE>` | Size of each index page.
`<INCLUDE>` | Include a resource file.
`<LABELBEG>` | Beginning markup of the label text of a message field.
`<LABELEND>` | End markup of the label text of a message field.
`<LABELSTYLES>` | Define HTML elements to wrap message header field labels.
`<LASTTPGLINK>` | Link markup for last page of main index.
`<LISTBEGIN>` | Markup to begin main index message listing.
`<LISTEND>` | Markup to end main index message listing.
`<LITEMPLATE>` | Markup for an entry in the main index message list.
`<LOCALDATEFMT>` | Conversion specification for printing local date.
`<LOCKMETHOD>` | How archive locks are done.
`<MAILTO>` `<NOMAILTO>` | Convert email addresses in message headers to hyperlinks.
`<MAILTOURL>` | URL template to use when MAILTO is set.
`<MAIN>` `<NOMAIN>` | Create main index.
`<MAXSIZE>` | Maximum number of messages in an archive.
`<MHPATTERN>` | Regex for matching message files in an MH folder (directory).
`<MIMEALTPREFS>` | Content-type preferences for `multipart/alternative` data.
`<MIMEARGS>` | Arguments to MIME filters.
`<MIMEDECODERS>` | Content-Transfer-Encoding decoding functions.
`<MIMEEXCS>` | Content-types to exclude.
`<MIMEFILTERS>` | Mapping of MIME filters to content-types.
`<MODIFYBODYADDRESSES>` `<NOMODIFYBODYADDRESSES>` | Apply ADDRESSMODIFYCODE to text message bodies.
`<MODTIME>` | Set modification time on message files to message dates.
`<MONTHS>` | Month names.
`<MONTHSABR>` | Abbreviated month names.
`<MSGBODYEND>` | Markup after the message body.
`<MSGEXCFILTER>` | Perl expression(s) to selectively exclude messages.
`<MSGFOOT>` | Markup at the foot of each message page.
`<MSGGMTDATEFMT>` | GMT conversion specification for message dates.
`<MSGHEAD>` | Markup at the head of each message page.
`<MSGIDLINK>` | Hyperlink markup for embedded message-ids in message pages.
`<MSGLOCALDATEFMT>` | Local conversion specification for message dates.
`<MSGPGBEGIN>` | Starting markup for each message page.
`<MSGPGEND>` | Ending markup for each message page.
`<MSGPGS>` `<NOMSGPGS>` | Print message pages.
`<MSGPGSSMARKUP>` | Markup at the beginning of all message pages.
`<MSGPREFIX>` | Prefix for message page filenames.
`<MSGSEP>` | Regex for matching message separator in mailbox files.
`<MULTIPG>` | Create multi-page indexes.
`<NEWS>` `<NONEWS>` | Hyperlink newsgroups in message headers.
`<NEXTBUTTON>` | Button markup for next message by main index.
`<NEXTBUTTONIA>` | Inactive button markup for next message by main index.
`<NEXTLINK>` | Link markup for next message by main index.
`<NEXTLINKIA>` | Inactive link markup for next message by main index.
`<NEXTPGLINK>` | Link markup for next page of main index.
`<NEXTPGLINKIA>` | Inactive link markup for next page of main index.
`<NOSUBJECTTXT>` | Raw subject text to use for messages without a subject.
`<NOTE>` | Markup for representing the annotation of a message.
`<NOTEDIR>` | Directory to store annotations.
`<NOTEIA>` | Markup when no annotation is available for a message.
`<OTHERINDEXES>` | List of alternate indexes to create for an archive.
`<PERLINC>` | Additional Perl include paths.
`<POSIXSTRFTIME>` | Use POSIX's strftime() for converted time format strings.
`<PREVBUTTON>` | Button markup for previous message by main index.
`<PREVBUTTONIA>` | Inactive button markup for previous message by main index.
`<PREVLINK>` | Link markup for previous message by main index.
`<PREVLINKIA>` | Inactive link markup for previous message by main index.
`<PREVPGLINK>` | Link markup for previous page of main index.
`<PREVPGLINKIA>` | Inactive link markup for previous page of main index.
`<REFSBEGIN>` | Beginning markup for explicit reference links in message pages.
`<REFSEND>` | Ending markup for explicit reference links in message pages.
`<REFSLITXT>` | Markup representing a reference entry in explicit reference links.
`<REVERSE>` `<NOREVERSE>` | Reverse the listing order in the main index.
`<SAVERESOURCES>` `<NOSAVERESOURCES>` | Save resource values in database.
`<SORT>` `<NOSORT>` | List messages by date in main index.
`<SPAMMODE>` `<NOSPAMMODE>` | Perform actions to deter email address harvesters.
`<SSMARKUP>` | Default markup at the beginning of all generated pages.
`<SUBJECTARTICLERXP>` | Regex for matching leading articles in message subjects.
`<SUBJECTBEGIN>` | Beginning markup for a subject group in the main index.
`<SUBJECTEND>` | Ending markup for a subject group in the main index.
`<SUBJECTHEADER>` | Main subject line markup above message header.
`<SUBJECTREPLYRXP>` | Regex for matching subject text denoting a reply message.
`<SUBJECTSTRIPCODE>` | Perl expressions to strip subject text while reading messages.
`<SUBJECTTHREADS>` `<NOSUBJECTTHREADS>` | Check subjects when computing message threads.
`<SUBSORT>` `<NOSUBSORT>` | List messages by subjext in main index.
`<TCONTBEGIN>` | Markup before the continuation of a broken thread.
`<TCONTEND>` | Markup after the continuation of a broken thread.
`<TENDBUTTON>` | Button markup for last message in thread.
`<TENDBUTTONIA>` | Inactive button markup for last message in thread.
`<TENDLINK>` | Link markup for last message in thread.
`<TENDLINKIA>` | Inactive link markup for last message in thread.
`<TEXTCLIPFUNC>` | Perl function to use for text clipping operations.
`<TEXTENCODE>` | Encode message text to given character encoding.
`<TFIRSTPGLINK>` | Link markup for first page of thread index.
`<TFOOT>` | Footer markup for thread index page.
`<THEAD>` | Header markup for thread index page.
`<THREAD>` `<NOTHREAD>` | Create thread index.
`<TIDXFNAME>` | Filename of first thread index page.
`<TIDXLABEL>` | Label string for the thread index.
`<TIDXPGBEGIN>` | Beginning markup for the thread index pages.
`<TIDXPGEND>` | Ending markup for the thread index pages.
`<TIDXPGSSMARKUP>` | Markup at the beginning of all thread index pages.
`<TIDXPREFIX>` | Filename prefix for thread index pages beyond the first page.
`<TIMEZONES>` | Hour offsets for timezones.
`<TINDENTBEGIN>` | Markup for opening a level when continuing a broken thread.
`<TINDENTEND>` | Markup for closing a level when continuing a broken thread.
`<TITLE>` | Title for main index.
`<TLASTTPGLINK>` | Link markup for last page of thread index.
`<TLEVELS>` | Maximum number of levels to indent in thread index.
`<TLIEND>` | Ending markup for a thread index message listing.
`<TLINONE>` | Markup for a missing message in thread index.
`<TLINONEEND>` | Ending markup for a missing message in thread index.
`<TLITXT>` | Markup for a thread index message listing.
`<TNEXTBUTTON>` | Button markup for next message by thread.
`<TNEXTBUTTONIA>` | Inactive button markup for next message by thread.
`<TNEXTINBUTTON>` | Button markup for next message within a thread.
`<TNEXTINBUTTONIA>` | Inactive button markup for next message within a thread.
`<TNEXTINLINK>` | Link markup for next message within a thread.
`<TNEXTINLINKIA>` | Inactive link markup for next message within a thread.
`<TNEXTLINK>` | Link markup for next message by thread.
`<TNEXTLINKIA>` | Inactive link markup for next message by thread.
`<TNEXTPGLINK>` | Link markup for next page in thread index.
`<TNEXTPGLINKIA>` | Inactive link markup for next page in thread index.
`<TNEXTTOPBUTTON>` | Button markup for first message in the next thread.
`<TNEXTTOPBUTTONIA>` | Inactive button markup for first message in the next thread.
`<TNEXTTOPLINK>` | Link markup for first message in the next thread.
`<TNEXTTOPLINKIA>` | Inactive link markup for first message in the next thread.
`<TOPLINKS>` | Markup for top navigational links of a message page.
`<TPREVBUTTON>` | Button markup for previous message by thread.
`<TPREVBUTTONIA>` | Inactive button markup for previous message by thread.
`<TPREVINBUTTON>` | Button markup for previous message within a thread.
`<TPREVINBUTTONIA>` | Inactive button markup for previous message within a thread.
`<TPREVINLINK>` | Link markup for previous message within a thread.
`<TPREVINLINKIA>` | Inactive link markup for previous message within a thread.
`<TPREVLINK>` | Link markup for previous message by thread.
`<TPREVLINKIA>` | Inactive link markup for previous message by thread.
`<TPREVPGLINK>` | Link markup for previous page in thread index.
`<TPREVPGLINKIA>` | Inactive link markup for previous page in thread index.
`<TPREVTOPBUTTON>` | Button markup for first message in the previous thread.
`<TPREVTOPBUTTONIA>` | Inactive button markup for first message in the previous thread.
`<TPREVTOPLINK>` | Link markup for first message in the previous thread.
`<TPREVTOPLINKIA>` | Inactive link markup for first message in the previous thread.
`<TREVERSE>` `<NOTREVERSE>` | List thread in reverse order.
`<TSINGLETXT>` | Markup for a thread listing with no follow-ups.
`<TSLICE>` | Size of thread listing slice for message pages.
`<TSLICEBEG>` | Markup for the start of a thread slice.
`<TSLICECONTBEGIN>` | Thread slice markup before the continuation of a broken thread.
`<TSLICECONTEND>` | Thread slice markup after the continuation of a broken thread.
`<TSLICEEND>` | Markup for the end of a thread slice.
`<TSLICEINDENTBEGIN>` | Thread slice markup for opening a level when continuing a broken thread.
`<TSLICEINDENTEND>` | Thread slice markup for closing a level when continuing a broken thread.
`<TSLICELEVELS>` | Maximum number of levels to indent in thread slices.
`<TSLICELIEND>` | Ending markup for a thread slice message listing.
`<TSLICELIENDCUR>` | Ending markup for a thread slice message listing if current message.
`<TSLICELINONE>` | Thread slice markup for a missing message in thread slice.
`<TSLICELINONEEND>` | Ending markup for a missing message in thread slice.
`<TSLICELITXT>` | Markup for a thread slice message listing.
`<TSLICELITXTCUR>` | Markup for a thread slice message listing if current message.
`<TSLICESINGLETXT>` | Markup for a thread slice listing with no follow-ups.
`<TSLICESINGLETXTCUR>` | Markup for a thread slice listing with no follow-ups if current message.
`<TSLICESUBJECTBEG>` | Markup before a subject based thread slice listing.
`<TSLICESUBJECTEND>` | Markup after a subject based thread slice listing.
`<TSLICESUBLISTBEG>` | Thread slice markup for starting a sub-thread.
`<TSLICESUBLISTEND>` | Thread slice markup for ending a sub-thread.
`<TSLICETOPBEGIN>` | Thread slice markup for the root/start of a thread.
`<TSLICETOPBEGINCUR>` | Thread slice markup for the root/start of a thread if current message.
`<TSLICETOPEND>` | Thread slice markup for the end of a thread.
`<TSLICETOPENDCUR>` | Thread slice markup for the end of a thread if current message.
`<TSORT>` `<NOTSORT>` | List threads by date.
`<TSUBJECTBEG>` | Markup before a subject based thread listing.
`<TSUBJECTEND>` | Markup after a subject based thread listing.
`<TSUBLISTBEG>` | Markup for starting a sub-thread.
`<TSUBLISTEND>` | Markup for ending a sub-thread.
`<TSUBSORT>` `<NOTSUBSORT>` | List threads by subject.
`<TTITLE>` | Title of thread index.
`<TTOPBEGIN>` | Markup for the root/start of a thread.
`<TTOPBUTTON>` | Button markup for first message in thread.
`<TTOPBUTTONIA>` | Inactive button markup for first message in thread.
`<TTOPEND>` | Markup for the end of a thread.
`<TTOPLINK>` | Link markup for first message in thread.
`<TTOPLINKIA>` | Inactive link markup for first message in thread.
`<UMASK>` | Umask value for the MHonArc process.
`<USELOCALTIME>` `<NOUSELOCALTIME>` | Use local time to determine day groups in main index listing.
`<USINGLASTPG>` `<NOUSINGLASTPG>` | $LASTPG$ is used in resource values.
`<WEEKDAYS>` | Weekday names.
`<WEEKDAYSABR>` | Abbreviated weekday names.

## Command-Line Options

Option | Description
`-add` | Add messages to the archive.
`-addressmodifycode` | Perl expressions modifying displayed addresses in headers.
`-afs` | Skip archive directory permission check.
`-annotate` | Add/set annotation for message(s).
`-archive` `-noarchive` | Create archive.
`-authsort` `-noauthsort` | Sort main index by author.
`-checknoarchive` `-nochecknoarchive` | Honor "no archive" flag in messages.
`-conlen` `-noconlen` | Use Content-Length value.
`-datefields` | List of fields to extract date of message.
`-dbfile` | Name of archive database file.
`-dbfileperms` | File permissions for DBFILE.
`-decodeheads` `-nodecodeheads` | Store "decode-only" characters sets in raw form.
`-definevar` | Define a custom resource variable.
`-doc` `-nodoc` | Add link to documentation.
`-docurl` | URL to documentation
`-editidx` | Modify archive with new resource settings.
`-expireage` | Length of time to keep a message in an archive.
`-expiredate` | Expiration of date of message.
`-fasttempfiles` `-nofasttempfiles` | Use non-random temporary filenames.
`-fileperms` | File permissions for archive files.
`-folrefs` `-nofolrefs` | Print links links to explicit follow-ups and references.
`-force` | Force archive operation even if lock cannot be obtained.
`-fromfields` | List of fields to extract author of a message.
`-genidx` | Generate a message index to standard output.
`-gmtdatefmt` | Conversion specification for GMT dates.
`-gzipexe` | Pathname to gzip executable.
`-gzipfiles` `-nogzipfiles` | Gzip files.
`-gziplinks` `-nogziplinks` | Assume files are gzipped when creating links.
`-htmlext` | Extension to use for HTML files.
`-iconurlprefix` | Prefix for icon URLs.
`-idxfname` | Filename for main (first) index page.
`-idxprefix` | Filename prefix for multi-page main index.
`-idxsize` | Size of each index page.
`-keeponrmm` | Do not physically delete message files when message removed from archive.
`-localdatefmt` | Conversion specification for printing local date.
`-lock` `-nolock` | Perform a lock on the archive.
`-lockdelay` | Wait time between lock attempts.
`-lockfile` | Name of the lock file.
`-lockmethod` | How archive locks are done.
`-locktries` | Total number of time to attempt a lock before failing.
`-mailto` | Convert email addresses in message headers to hyperlinks.
`-mailtourl` | URL template to use when MAILTO is set.
`-main` | Create main index.
`-maxsize` | Maximum number of messages in an archive.
`-mhpattern` | Regex for matching message files in an MH folder (directory).
`-modifybodyaddresses` `-nomodifybodyaddresses` | Apply ADDRESSMODIFYCODE to text message bodies.
`-modtime` | Set modification time on message files to message dates.
`-months` | Month names.
`-monthsabr` | Abbreviated month names.
`-msgexcfilter` | Perl expression(s) to selectively exclude messages.
`-msggmtdatefmt` | GMT conversion specification for message dates.
`-msglocaldatefmt` | Local conversion specification for message dates.
`-msgpgs` `-nomsgpgs` | Print message pages.
`-msgprefix` | Prefix for message page filenames.
`-msgsep` | Regex for matching message separator in mailbox files.
`-multipg` | Create multi-page indexes.
`-news` | Hyperlink newsgroups in message headers.
`-nosubjecttxt` | Raw subject text to use for messages without a subject.
`-notedir` | Directory to store annotations.
`-notetext` | Annotation text.
`-otherindexes` | List of alternate indexes to create for an archive.
`-outdir` | Location of archive.
`-perlinc` | Additional Perl include paths.
`-posixstrftime` | Use POSIX's strftime() for converted time format strings.
`-quiet` | Do not output status.
`-rcfile` | Resource file to read before processing input.
`-reconvert` `-noreconvert` | Reconvert existing messages.
`-reverse` `-noreverse` | Reverse the listing order in the main index.
`-rmm` | Remove specified messages from an archive.
`-saveresources` `-nosaveresources` | Save resource values in database.
`-scan` | List archive messages to standard output.
`-single` | Process a single message.
`-sort` | List messages by date in main index.
`-spammode` `-nospammode` | Perform actions to deter email address harvesters.
`-stderr` | File for standard error messages.
`-stdin` | File to treat as standard input.
`-stdout` | File for standard output messages.
`-subjectarticlerxp` | Regex for matching leading articles in message subjects.
`-subjectreplyrxp` | Regex for matching subject text denoting a reply message.
`-subjectstripcode` | Perl expressions to strip subject text while reading messages.
`-subjectthreads` `-nosubjectthreads` | Check subjects when computing message threads.
`-subsort` | List messages by subjext in main index.
`-thread` | Create thread index.
`-tidxfname` | Filename of first thread index page.
`-tidxprefix` | Filename prefix for thread index pages beyond the first page.
`-title` | Title for main index.
`-tlevels` | Maximum number of levels to indent in thread index.
`-treverse` | List thread in reverse order.
`-tslice` | Size of thread listing slice for message pages.
`-tslicelevels` | Maximum number of levels to indent in thread slices.
`-tsort` `-notsort` | List threads by date.
`-tsubsort` `-notsubsort` | List threads by subject.
`-ttitle` | Title of thread index.
`-umask` | Umask value for the MHonArc process.
`-varregex` | Perl regular expression matching a resource variable.
`-weekdays` | Weekday names.
`-weekdaysabr` | Abbreviated weekday names.