flnews(1)                     flnews 1.0.0 manual                    flnews(1)




NAME

       flnews - Fast and lightweight USENET client with GUI


SYNOPSIS

       flnews [-display [host]:display] [-geometry WxH[+X+Y]]

       flnews [-h|-v]


DESCRIPTION

       If  you don't know what USENET is, you probably want to read this arti-
       cle first:

       https://en.wikipedia.org/wiki/Usenet

       flnews is a client with graphical user interface  that  uses  the  NNTP
       protocol defined in RFC 3977 to get USENET news articles defined in RFC
       5536 from a server via IP network. Version 1 of the NNTP  protocol  (as
       defined  in  RFC  977)  is supported too and automatically used, if the
       server does not report support for Version 2.

       If compiled with support for ssl(3),  the  NNTPS  protocol  (NNTP  over
       encrypted  TLS  connection)  is  supported.  For  NNTPS connections the
       server to client authentication via X509  certificate  is  always  per-
       formed.  Optionally  the  client can authenticate to the server via the
       AUTHINFO USER/PASS extension defined in RFC 4643.

       If compiled with support for compression and zlib(3), the NNTP COMPRESS
       extension  is supported. Compression negotiation is disabled by default
       and can be enabled on the 'Edit->Configuration->Misc' tab in  the  user
       interface.   Because  compression in general can weaken the underlaying
       encryption, the optional authentication is always done before  compres-
       sion is negotiated.  For the same reason compression negotiation should
       be disabled for reading groups that contain articles with  confidential
       information.

       flnews  provides  full Unicode support, including NFC normalization for
       posting and search/compare operations. Article content is converted  to
       ISO  8859-1  before  posting  (if  possible) to be more friendly to old
       clients.  The ability to display Unicode content  depends  on  the  GUI
       toolkit fltk(3).  Even if the content could not be correctly displayed,
       it is always possible to correctly quote it in follow-up articles.

       flnews has MIME support according to RFC 2045, RFC 2046, RFC  2047  and
       RFC  2231.   Since  version 0.18 full MIME conformance according to RFC
       2049 Section 2 was reached.  Posted articles should be fully  RFC  5536
       conformant (without postprocessing by the user).

       Additional  checks  are  implemented that create warnings if an article
       violates common USENET conventions. Conformance to mandatory GNKSA  2.0
       rules was reached with exception of part 4 (the "Reply-To" header field
       can only be modified before the article composer is started):

       https://js.home.xs4all.nl/gnksa/

       Currently flnews 1.0.0 provides no support for the following features:

       o  Multiple servers

       o  Offline mode

       o  UUCP

       If you need one of these features, use  leafnode(8)  or  another  proxy
       server (consider Hamster for machines with Windows operating system).


OPTIONS

       The following options are supported:

       -4                       Force usage of IPv4 network protocol.

       -confprefix path         Use different configuration directory.  Atten-
                                tion: Never set path to an existing configura-
                                tion  directory  for  flnews  with a different
                                major version number!

       -debug                   Enable debug mode.

       -display [host]:display  X display to use. More information about X can
                                be found in X(7).

       -geometry WxH[+X+Y]      Window size and position.

       -h                       Print help message.

       -iconic                  Starts with minimized window.

       -notooltips              Disable tooltip messages.

       -v                       Print  version  and  compile time options.  If
                                reproducible build is disabled, the build date
                                is printed too.


EXIT STATUS

       Zero on regular exit. All other values indicate an error.


ENVIRONMENT

       DISPLAY                  X display to use. More information about X can
                                be found in X(7).

       FLTK_SCHEME              Selects  the  FLTK  scheme  to use. FLTK 1.3.0
                                accepts the following options:

                                o  none (Default style)

                                o  gtk+ (GTK+ style)

                                o  plastic (Aqua style)

                                Newer  FLTK  versions  may  accept  additional
                                schemes.

       TMPDIR                   Directory  used for temporary files (as recom-
                                mended by POSIX). This value will override the
                                default "/tmp".

       TZ                       The timezone that  is  used  by  localtime(3).
                                flnews  internally  uses this function to con-
                                vert POSIX timestamps to local  time  and  for
                                creating  'date-time'  tokens according to RFC
                                5322.

       XDG_CONFIG_HOME          Prefix  for   configuration   directory   path
                                according to XDG Base Directory Specification.
                                This value will override the default  "~/.con-
                                fig".   The program name flnews is appended as
                                last path component.

       In addition, flnews honours the following locale related variables:

       LANG                     Used  as  fallback  if  LC_* variables are not
                                set.

       LC_ALL                   Overdrives all other LC_* variables.

       LC_CTYPE                 Character  classification to use. Only locales
                                with US-ASCII, ISO 8859-1 and  UTF-8  codesets
                                are  allowed  here.  Setting  this to a locale
                                with UTF-8 codeset is very expensive  on  some
                                operating  systems (e.g. more than an order of
                                magnitude slower on NetBSD 5).  Note that set-
                                ting  this  to  POSIX  or an ISO 8859-1 locale
                                will not completely disable  Unicode  support!
                                You  can at least use Unicode for your name in
                                the identity configuration and  you  can  cor-
                                rectly  quote  Unicode  content  for follow-up
                                articles in any case.

       LC_MESSAGES              Locale for user interface language. The  code-
                                set  is ignored because FLTK internally always
                                use UTF-8 (regardless of the locale settings).
                                If  flnews  is  compiled without National Lan-
                                guage Support (NLS), this variable is ignored.

       As a general rule, POSIX.2 define that all locale sections must use the
       same  codeset.  More  information  about  NLS can be found in nls(7) or
       locale(7) depending on the operating system.


X RESOURCES

       Information about X resources and how to set them can be found in X(7).

       fltk.scheme              (String)   See   the   environment    variable
                                FLTK_SCHEME  for possible values. The environ-
                                ment  variable  takes  precedence  over   this
                                ressource.

       Text.selectBackground    (String)  The value of this ressource is taken
                                as the background  color  for  selected  text.
                                Set  it  to  something  like "gray" for a more
                                decent  selection  color.   On  machines  with
                                8-bit  color  depth  the  highlight  color for
                                search  results  (that  is  derived  from  the
                                selection background color) may have little or
                                no contrast. Use a darker color in this  case,
                                e.g. "darkgray".

       Xft.antialias            (Boolean)  If FLTK uses the X11 backend and is
                                compiled to use Xft (the  default),  then  the
                                value "true" will enable and "false" will dis-
                                able font anti-aliasing.  The recommended set-
                                ting is "true".

       Xft.hinting              (Boolean)  If FLTK uses the X11 backend and is
                                compiled to use Xft (the  default),  then  the
                                value "true" will enable and "false" will dis-
                                able font hinting.  The recommended setting is
                                "true".

       Xft.autohint             (Boolean)  If  FLTK  uses  the X11 backend, is
                                compiled to use Xft (the default) and  Xft  is
                                configured with enabled font hinting (resource
                                Xft.hinting set to "true") then this  resource
                                controls  the  hinting algorithm. With setting
                                "false" the  BCI  algorithm  is  used,  "true"
                                enables  the  builtin autohinter of Freetype2.
                                The recommended setting is "false".

       Xft.hintstyle            (Integer) If FLTK uses  the  X11  backend,  is
                                compiled  to  use Xft (the default) and Xft is
                                configured with enabled font hinting (resource
                                Xft.hinting  set to "true") then this resource
                                controls the hinting mode. Possible values are
                                "hintnone" (0), "hintslight" (1), "hintmedium"
                                (2) and "hintfull" (3).  The recommended  set-
                                ting is "hintfull" (3).

                                Attention: With some modes it is possible that
                                lines will overlap and characters like  under-
                                score are clipped!


FILES

       ~/.signature             The  signature from this file is automatically
                                appended to all created articles.
                                This file is not used if another location  for
                                the signature file is configured.  See CONFIG-
                                URATION section below for details  (configfile
                                entry "signature_file").

                                Note:  At  this  (shared)  location  the  file
                                should be US-ASCII encoded. If you want to use
                                Unicode  in  signatures, a dedicated signature
                                file for flnews should be configured.

       The following files are inside the configuration directory. The default
       location  is  "~/.config/flnews".  The  environment  variable  XDG_CON-
       FIG_HOME and the option -confprefix (highest precedence) can be used to
       modify the configuration directory location.

       .cancelsecret            Secret  for generating Cancel-Locks/-Keys with
                                scheme SHA256 according to RFC 8315.
                                The secret in this file must be a cryptograph-
                                ically  random value according to RFC 4086 and
                                should be at least 32 octets in length.

                                flnews  must  be  compiled  with  support  for
                                ssl(3)  or  this file will be ignored, because
                                the cryptographic functions are shared.

                                If this file is not present, it  is  automati-
                                cally  created  and a new secret is written to
                                it (using random data from  the  cryptographic
                                PRNG).

                                If this file is present and not empty, and the
                                fqdn entry is  set,  flnews  creates  "Cancel-
                                Lock"  (always) and "Cancel-Key" header fields
                                when canceling or superseding articles.

                                To use the same secret as another installation
                                of  flnews (or another newsreader that use the
                                algorithm recommended by RFC  8315  with  HMAC
                                based  on  SHA256),  copy  the  file  with the
                                desired secret to this location.

                                To manually disable  this  feature,  an  empty
                                file must be used.

                                Attention: Everybody who get his hands on this
                                secret can cancel articles  that  were  locked
                                using  this  key in the past! This file should
                                be readable only by the user.

                                The old scheme SHA1 is  still  supported  too.
                                See  CONFIGURATION  section  below for details
                                (configfile entry "cancelkey").

       configfile               Configuration and user interface state of last
                                session.  The file format is forward and back-
                                ward compatible between all versions with same
                                major number.

                                See CONFIGURATION section below for details.

       groupfile                Subscribed  groups and already viewed articles
                                database. The  data  is  US-ASCII  encoded  in
                                newsrc  format  and  can  be shared with other
                                newsreaders using the entry newsrc in  config-
                                file.  It  is possible to share the group data
                                over machine borders by  using  a  NFS  server
                                (advisory file locking support is required).

                                Attention:  In  any  case all newsreaders that
                                share a groupfile must be  configured  to  use
                                the same server! There is a convention to name
                                such files "newsrc-$HOSTNAME" to make it obvi-
                                ous for which server they can be used.

                                It  is  allowed to share the groupfile between
                                multiple instances of flnews that run simulta-
                                neously.  The  file  will contain the state of
                                the instance that is terminated last.

       headers/*                Cached article header database. The file names
                                correspond  to  the  article watermarks of the
                                current NNTP server. If  the  server  provides
                                the  OVER capability defined in RFC 3977, this
                                database is not used.

       logfile                  Protocol dump  of  server  communication  from
                                current/last  session. To view this data while
                                the program is running, select  'Tools->Proto-
                                col  console' in the user interface. This file
                                is overwritten for every new connection.

       scorefile                Scoring rules. The file format is forward  and
                                backward  compatible between all versions with
                                same major number.

                                See SCORING section below for details.


CONFIGURATION

       This section describes the format of the configfile.

       This file must be a POSIX textfile, this means every line must be  ter-
       minated with a LF line break.

       Any  line  starting  with  '#'  is treated as a comment (not parsed and
       ignored).  Missing entries are automatically added, unsupported entries
       are ignored.

       The  content  can  have  one  of  two types: Integer or Unicode string.
       Strings use the UTF-8 representation and NFC normalization of Unicode.

       The following entries are supported by version 1.0.0 but can't be  con-
       figured  from  the GUI. Some have no GUI editor by intent. If you don't
       know what you are doing, consider to not modify them.

       o  cancelkey (String) Secret  for  generating  Cancel-Locks/-Keys  with
          scheme SHA1 according to RFC 8315

          flnews  must  be compiled with support for ssl(3) to make this work,
          because the cryptographic functions are shared.

          Note: The scheme SHA1 is deprecated by RFC 8315. This entry is  pre-
          served  for  backward  compatibility. After a transition period this
          entry should be left empty and the scheme SHA256 should be used. See
          section above (File "~/.flnews/.cancelsecret").

       o  crl_check (Integer) Enable TLS certificate CRL checks

          A nonzero value means that CRL checks are enabled.

          flnews  must  be  compiled  with support for CRL checks to make this
          work.

       o  crl_upd_c (Integer) TLS certificate CRL update choice

          A nonzero value means  that,  after  the  CRL  update  interval  has
          elapsed,  the  user  get  a  choice to select whether the CRL update
          should be delayed.

       o  crl_upd_iv (Integer) TLS certificate CRL update interval

          The value must be positive and is a period of  time  in  hours.  Too
          large  values (longer than one year) are clamped to the upper limit.
          The value zero means that new CRLs should be  downloaded  for  every
          new connection (not recommended).

       o  crl_upd_ts (String) TLS certificate CRL update timestamp

          This entry contains a timestamp in ISO 8601 format for the last suc-
          cessful CRL update.

       o  dist_suggestions (Integer) Use distribution suggestions

          Setting this to a nonzero value automatically initialize the distri-
          bution header field in the composer with suggested distribution data
          (if available).  If no distribution suggestions  are  available  for
          the  target  groups,  the  header field is initialized to "world" as
          with this option set to zero.

          Any time a distribution suggestion is used,  the  user  is  informed
          with a popup window in the GUI.

          With  the  NNTP  protocol  the  command LIST DISTRIB.PATS is used to
          retrieve the distribution suggestions from the server.

       o  editor (String) Optional external editor for article composition

          The pathname of a file containing the data is passed  as  parameter.
          The  editor  must  be  able to process Unicode data in UTF-8 format.
          The specified editor must terminate with exit status  zero  on  suc-
          cess.

          A  temporary  file  is  used. Consider to set the TMPDIR environment
          variable.

       o  flowed_insert_crlf (Integer) Add empty line after paragraph

          Only used if "Format=flowed" is declared.

          A value of zero corresponds to the dumb behaviour up to version 0.16
          (if  a  paragraph ends with an empty line, there is no separation to
          the following text).

          A value of one adds an empty line separator  after  every  paragraph
          that ends with an empty line. This is required to create single line
          paragraphs (allow single line to be rewrapped to smaller  width  for
          display).   The author of an article can request this behaviour with
          the  experimental  parameter  "InsLine=yes"  in  addition  to  "For-
          mat=flowed".

       o  fqdn (String) Fully qualified domain name (FQDN) of the machine

          Must  be  empty  or  a  valid "dot-atom" according to RFC 5322, this
          means the nameless root domain must be omitted (no trailing dot).

          This entry is used to generate Message-IDs. They are only  worldwide
          unique  for  all  time  if  flnews runs on a machine with a FQDN. In
          addition the clock of the machine must be synchronized so that time-
          stamps are not ambigous.

          If a FQDN is configured, the header fields "Message-ID", "Injection-
          Date", "Cancel-Lock"  and  "Cancel-Key"  (only  when  cancelling  or
          superseding an article) are created by flnews for all outgoing arti-
          cles. Note that RFC 5537 specify some nasty details for the  "Injec-
          tion-Date" header field (they are the reason to handle it internally
          in this case).

       o  force_unicode (Integer) Force Unicode for outgoing articles

          With the value zero outgoing articles are converted to ISO 8859-1 if
          possible.  With a nonzero value, all articles are sent using Unicode
          (UTF-8 transformation format).

       o  immedauth (Integer) Immediate authentication option

          The value one represents the default behaviour to authenticate imme-
          diately after a connection was established.

          The  value  zero  switches  the  behaviour,  so  that authentication
          against the server is only executed after a request to  do  so  (480
          response when using NNTP protocol).

       o  inews (String) Pathname of an optional external inews

          The external inews must accept the article on its standard input and
          inject it into the network.  After  successful  completion  of  this
          task  it  must  terminate  with  exit status zero. In the case of an
          error, it must terminate with a nonzero exit status.

          Note that the article feeded into the external inews  has  canonical
          format (CR+LF line breaks).

          If  your  inews  needs  command line parameters or a different input
          format, specify a shell script here (and  call  the  external  inews
          from this script).

       o  initial_greeting  (String)  Greeting  line  for first article of new
          thread

          The content is automatically inserted into the  body  of  every  new
          regular article (that is not a followup, cancel or supersede).

       o  intro (String) Introduction line format

          The  name  of the cited author can be inserted with "%s".  The news-
          groups list of the cited article can be inserted with  "%g".   Every
          variable is allowed only once.

          The last character should be a colon.

       o  inv_order (Integer) Inverse order

          The value zero is the default behaviour (top down).

          A  nonzero  value  inverts  the order of articles or thread branches
          respectively.

       o  newsrc (String) Optional pathname of file to share group  states  in
          newsrc format

          This  file is imported at startup and used as groupfile. At exit the
          local groupfile is copied back to this location. Note that this file
          is replaced with rename(2) and is not modified in place. If the file
          is accessed via NFS, advisory locking must be available.

       o  nntp_no_over (Integer) Disable usage of overview (OVER command)  for
          NNTP protocol

          Setting this to a nonzero value disables usage of overview and makes
          the whole newsgroup list usable for scoring rules.

          In general the default value 0 should be used. There are two scenar-
          ios for which this option may be useful.

          If  the  network  connection  to the server is very slow and no data
          compression is available: In this case the transfer of the  (larger)
          overview  may  be  slower  than  the transfer of a few (smaller) new
          headers, because the older headers  can  be  taken  from  the  local
          cache.

          If  one or more scoring rules should match other (not the current or
          not subscribed at all) newsgroups in Xposts: Because  the  newsgroup
          list  is  not part of the overview, only the current group is avail-
          able if the overview is used.

       o  organization (String) Optional name of the users organization

          The string is inserted as 'Organization' header  field  in  outgoing
          articles.

       o  post_proc (String) Pathname of an optional article postprocessor

          Note: The postprocessor can be used to insert custom header fields.

          The postprocessor must be a filter in Unix sense. It must accept the
          article on its standard input, process it and write  the  result  to
          its  standard  output.   After successful completion of this task is
          must terminate with exit status zero. In the case of an  error,  the
          postprocessor must terminate with a nonzero exit status.

          Note  that  the  article feeded into the postprocessor has canonical
          format (CR+LF line breaks) and use Unicode UTF-8  encoding  for  the
          body.  Modifications must preserve this format.  The Unicode normal-
          ization, potential conversion to the target character  set  and  the
          application  of  the transfer encoding to the body is done after the
          postprocessing. Therefore the postprocessor is not  allowed  to  add
          "Content-Type" and "Content-Transfer-Encoding" header fields!

          The header is already in RFC 2047 format. If the postprocessor modi-
          fies an existing header field, this format must be preserved.  If  a
          new header field is added, the postprocessor is responsible for cre-
          ating valid RFC 2047 encoding and Unicode normalization to NFC.

       o  scorerc (String) Optional pathname of file to share scoring rules

          This file is imported at startup and used as scorefile. At exit  the
          local scorefile is copied back to this location. Note that this file
          is replaced with rename(2) and is not modified in place. If the file
          is accessed via NFS, advisory locking must be available.

       o  signature_file (String) Pathname of file with signature (relative to
          home directory)

          Default value: ".signature".

          If this file is present, its content is used as signature.  The sig-
          nature  separator  "dash dash space" plus LF line break is automati-
          cally prepended if not already present in this file.  The file  must
          be  a POSIX text file (LF line break after every line, including the
          last one) with Unicode encoding in UTF-8 format (Unicode  normaliza-
          tion is not important and applied automatically).

          Use an empty string to disable signature generation.

       o  testgrp_ere (String) POSIX.2 extended regular expression (Unicode is
          allowed)

          If non US-ASCII characters are used in the regular expression,  they
          must be representable in the codeset of the character classification
          locale used at runtime. Otherwise the regular expression  from  this
          entry  is  ignored  and will never match. See the desciption for the
          LC_CTYPE environment variable above for details.

          Note that this regular expression is used for matching against indi-
          vidual  group  names,  not  group lists. This means '^' and '$' will
          match start and end of individual group names.

          If a match is detected against a group name, this group  is  treated
          as  a  test  group  that may require special control commands in the
          "Keywords" header field to silence e.g. reflector  bots  (see  entry
          "testgrp_kwords" for keyword configuration).

       o  testgrp_kwords (String) Comma separated list of words

          If  a  target  group of an article is identified as a test group (as
          described for the "testgrp_ere" entry), the header field  "Keywords"
          is initialized to the value defined with this entry.

          Attention:  Version 1.0.0 of flnews currently only supports US-ASCII
          keywords. Do not use spaces around commas.

       o  timestamp_comment (Integer) Generate Date header field with timezone
          comment

          The  value  zero  represents the default behaviour to append no com-
          ment.

          The value one switches the behaviour, so that  a  comment  with  the
          name  of  the  timezone is appended to the Date header field. If the
          operating system does not provide timezone information,  this  entry
          is ignored.

       o  tls_owncerts (Integer) Use local trust anchors for TLS

          With  nonzero  value  the trust anchor (X.509 root certificate) of a
          certificate chain is searched in the local location only. The system
          wide certificate store of the OpenSSL installation is ignored.

          Local X.509 certificate path: ~/.flnews/certs

          Copy  the  root certificate (in PEM format) to a file with arbitrary
          name in the path specified above. Then run the c_rehash  utility  to
          create the symlink that OpenSSL uses for searching.


SCORING

       This section describes the format of the scorefile.

       This  file must be a POSIX textfile, this means every line must be ter-
       minated with a LF line break.

       Any line starting with '#' is treated as  a  comment  (not  parsed  and
       ignored).   All  other lines are parsed as rules with 4 colon-separated
       fields:

       o  Target The groups to which the rule is associated.

          This must be a wildmat according to RFC 3977. The wildmat  "*"  will
          match all groups.

       o  Type The header field to which the rule is associated. This field is
          case sensitive.

          The following types (in alphabetical order) are recognized  by  ver-
          sion 1.0.0.

          Type  "from":  The  string from the third field must match literally
          against the "From" header field.

          Type "from_ere": The string from the third field is interpreted as a
          POSIX.2  extended  regular  expression  and  must  match against the
          "From" header field.

          Type "group": The string from the third field must  match  literally
          against a group element in the "Newsgroups" header field.

          Type  "msgid_ere": The string from the third field is interpreted as
          a POSIX.2 extended regular expression and  must  match  against  the
          "Message-ID" header field.

          Type "subject": The string from the third field must match literally
          against the "Subject" header field.

          Type "subject_ere": The string from the third field  is  interpreted
          as  a POSIX.2 extended regular expression and must match against the
          "Subject" header field.

          Type "extended": All rules with this type use a new, different  syn-
          tax  with  5  fields.  This  type  is used for compatibility reasons
          (older parsers will ignore "extended" rules).  The second  field  of
          this  type  is a newsgroup wildmat that allows to limit the scope of
          the rule. The wildmat syntax is as defined  in  RFC  3977  with  the
          exceptions  that  colon  is not allowed (because it is used as field
          separator) and SP is not allowed between tokens (e.g.  around  comma
          or  exclamation  mark).   The last 3 fields are the same as with the
          original syntax.

          Note that  rules  using  wildmats  and/or  regular  expressions  are
          ignored  if  flnews  is compiled without support for regular expres-
          sions.

       o  Score The score value that apply if the filter rule matches.

          This must be a signed integer value.  If  the  scorefile  is  shared
          between  multiple instances of flnews, the values must be usable for
          the whole group. The machine with the smallest limits will clamp the
          values if they are too large or too small respectively.

       o  String The rules content string.

          This must always be an Unicode string (in UTF-8 format with NFC nor-
          malization).

          Attention: If the normalization is wrong, the rule may not match  as
          intended!

          The  colon has no special meaning inside this field anymore and must
          not be quoted for any of the rule types listed above.

       The default score for every article is zero. If  a  rule  matches,  the
       score  value  from  the second field will be added to the corresponding
       article. Note that the processing is not stopped  after  a  match,  the
       following rules are applied too.

       Articles  with  nonzero  score result are marked with icons in the GUI.
       Articles with negative score result are additionally marked as read.


NOTES

       flnews is based in part on the work of the following projects:

       o  FLTK toolkit for graphical user interface (https://www.fltk.org/)

       o  Unicode standard for text encoding (https://www.unicode.org/)

          Unicode is a registered trademark of Unicode,  Inc.  in  the  United
          States and other countries.

       o  OpenSSL cryptographic libraries (https://www.openssl.org/)

          If compiled with support for TLS.

       o  LibreSSL cryptographic libraries (https://www.libressl.org/)

          If compiled with support for TLS (as replacement for OpenSSL).

       o  zlib compression library (https://zlib.net/)

          If compiled with support for compression.


AUTHORS

       To   view   the   list   of  authors  and  the  license  terms,  select
       'Help->License' in the user interface.


BUGS

       To report bugs, select 'Help->Bug report' in the user interface.


STANDARDS

       flnews tries to comply with the following standards:

       ISO 2022, ISO 8601, ISO 8859, RFC 20, RFC 822, RFC 850,  RFC  977,  RFC
       1468,  RFC  1738, RFC 2045, RFC 2046, RFC 2047, RFC 2049, RFC 2104, RFC
       2152, RFC 2183, RFC 2231, RFC 2246, RFC 2368, RFC 2585, RFC  2606,  RFC
       2646,  RFC  2980, RFC 3174, RFC 3629, RFC 3676, RFC 3977, RFC 3986, RFC
       4346, RFC 4642, RFC 4643, RFC 5198, RFC 5246, RFC 5280, RFC  5322,  RFC
       5536,  RFC  5537, RFC 5538, RFC 6048, RFC 6066, RFC 6068, RFC 6176, RFC
       6657, RFC 7230, RFC 7231, RFC 7234, RFC 7366, RFC 7507, RFC  7568,  RFC
       7627,  RFC  7919, RFC 8054, RFC 8089, RFC 8143, RFC 8315, RFC 8446, RFC
       8996, POSIX.2-1992, POSIX.1-1996, POSIX.1-2001,  POSIX.1-2008,  Unicode
       13.0.0, XDG Base Directory Specification 0.7


SEE ALSO

       fltk(3), leafnode(8), locale(7), localtime(3), nls(7), ssl(3), zlib(3),
       X(7)
       https://en.wikipedia.org/wiki/Usenet
       https://js.home.xs4all.nl/gnksa/



Unix                              2021-05-09                         flnews(1)