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uterm.1.gz

uterm(1)           Unicode terminal window starter          uterm(1)



NAME
       uterm - start script for a Unicode capable terminal window

SYNTAX
       uterm [ -terminal-options ] [ -e program arguments ... ]

       uterm  [  -rx  | -rxvt ] [ -rxvt-options ] [ -e program argu‐
       ments ... ]
       uterm [ -xt | -xterm ] [ -xterm-options ] [ -e program  argu‐
       ments ... ]

DESCRIPTION
       Invoke a terminal window with a reasonably optimised range of
       Unicode support, enforcing UTF-8 mode and using the best Uni‐
       code  fonts found.  Many systems are not yet properly config‐
       ured to enable easy and straight-forward use of Unicode in  a
       text-mode  terminal environment (such as xterm or rxvt).  The
       purpose of uterm is to help users to start  a  terminal  with
       good Unicode capabilities without much hassle.

   Terminal selection
       Either  of  xterm or rxvt-unicode is selected as the terminal
       application to start, depending on:

              ·      Availability of rxvt-unicode: The script checks
                     whether  rxvt-unicode  is  available  under the
                     name urxvt (e.g. on  cygwin),  or  if  rxvt  is
                     available,  whether it actually is rxvt-unicode
                     (and not an older version). Only if this  check
                     is positive, rxvt is considered.

              ·      User  preference,  implicit: If the environment
                     variable TERM starts with "rxvt",  rxvt-unicode
                     is preferred.

              ·      User  preference,  explicit:  With  the command
                     line option --rx or -rxvt, rxvt-unicode is pre‐
                     ferred.   With  -xt  or  -xterm,  xterm is pre‐
                     ferred.

              ·      Font selection: If the GNU unifont is selected,
                     rxvt is chosen.

              ·      In all other cases, xterm is chosen.
       Users  of  mlterm  are  assumed  to  start  mlterm themselves
       directly, so mlterm is not considered.  Neither of  KDE  kon‐
       sole  or  gnome-terminal  is  currently considered since they
       cannot be font-configured on-the-fly.

   Font selection
       The uterm script tries its best to use fonts that  provide  a
       maximum of Unicode support.

              ·      First  it  checks if you have the 10x20 Unicode
                     font and a matching  20x20  double  width  font
                     installed (see explanation below about CJK cov‐
                     erage).

              ·      If not, it checks if you have the 9x18  Unicode
                     font  and  a  matching  18x18 double width font
                     installed and uses them.

              ·      If both are not found, it tries to invoke  rxvt
                     with the GNU unifont.

              ·      If   either   GNU   unifont  or  rxvt  are  not
                     installed, efont is tried.

              ·      As a last resort, it tries to invoke xterm with
                     6x13 and 12x13 fonts.

              ·      As  a very last fallback, it invokes xterm with
                     its configured default fonts.
       Note: The efonts are installed  on  fewer  systems  than  the
       misc-fixed  fonts so only 1 size of them is considered and at
       a lower priority. If you prefer efont, you  should  configure
       xterm  font  usage  yourself (using X resource configuration)
       and invoke xterm directly.
       Note: GNU unifont does unfortunately not work with xterm  (or
       rather  xterm  with  GNU  unifont),  so  in this case rxvt is
       invoked.

        Information about font usage
       Font selection is a matter of both taste and script coverage.
       The  uterm  script uses fonts with a good coverage of Unicode
       script ranges, but its order of precedence may not suit  your
       specific  needs. In that case you should configure your exact
       desired font  preference  and  invoke  the  desired  terminal
       (xterm,  rxvt)  directly.   Coverage of certain scripts would
       suggest certain font preferences: Korean Hangul: GNU  unifont
       Devanagari: efont Georgian: efont, misc X fonts
           ...

        CJK coverage and the 10x20 fonts
       Among  the  Unicode  "misc"  X fonts (misc-fixed-...), the 20
       pixel size fonts are much clearer in appearance than  the  18
       pixel fonts for which CJK wide fonts (using double cell width
       in a fixed-width  terminal)  are  available.   Unfortunately,
       xterm is not yet capable of padding an 18x18 font up to 20x20
       pixel character cells for use together  with  a  10x20  pixel
       font.   The  bdf18to20 script, packaged with the mined editor
       like uterm, helps with this issue and generates  the  missing
       fonts  from  the 18 pixel double width fonts by padding blank
       pixels.  If you have installed those, uterm  will  select  20
       pixel fonts as its first preference.
       Note:   20x20  fonts  (padded  with  bdf18to20)  are  already
       installed as part of the xterm package with SuSE Linux 10.0.
       Note: The 6x13 pixel font from Unicode  misc-fixed-...   also
       has  a  matching  12x13 CJK font but that size is really much
       too small for serious application on  modern  desktops  which
       often  provide  higher  resolutions than traditional worksta‐
       tions.

   UTF-8 environment setup
       The uterm script enforces UTF-8 mode with  the  terminal  and
       also sets up the locale variable environment to reflect UTF-8
       terminal encoding.  If necessary, all LC_* and LANG  environ‐
       ment  variables  are modified to provide a proper environment
       for applications started inside the  Unicode  terminal.  (See
       the  inline documentation of the uterm script for how this is
       done.)

   X resource class
       When starting xterm, uterm uses the X resource  class  UXTerm
       so  you  can  configure  the desired appearance of UTF-8 mode
       terminal windows  in  your  X  resource  configuration.   For
       rxvt-unicode, the class URxvt can be used for X resources.

   Unicode width data version
       If  called  with an -e option to invoke a specific program in
       it, uterm enables the -mk_width option  of  xterm  (if  xterm
       version  201 or newer is available).  This tells xterm to use
       its own, compiled-in character width property tables,  rather
       than  using system locale information.  The advantage is that
       this information is often newer (referring to a newer version
       of Unicode) than the installed system data.  Thus the user is
       enabled  to  use  up-to-date  Unicode   data   by   using   a
       self-installed  copy  of  xterm, rather than being stuck with
       the Unicode data  that  the  system  administrator  cares  to
       install.   This  is  especially  useful if the application is
       known to be able to recognise that Unicode version, like  the
       Unicode  editor  mined.   The umined script makes use of this
       feature to invoke mined in a Unicode terminal with a  maximum
       of Unicode support.

   Keyboard resources for application use
       If  called  with an -e option to invoke a specific program in
       it, uterm also enables a number of other xterm  resources  in
       order to enable best keyboard and terminal control for appli‐
       cations:

       *VT100*eightBitOutput:true
              to enable 8 Bit output (actually not needed  in  UTF-8
              mode)

       *VT100*metaSendsEscape:true
              to enable ESC prefixing triggered by Alt-key

       *VT100*eightBitInput:false
              to  enable  ESC  prefixing triggered by Alt-key in old
              xterm versions

       *VT100*deleteIsDEL:true
              to enable distinguishing the two DEL keys on the  key‐
              board

       *utf8Title:true
              to enable UTF-8 window title strings

FILES
       $HOME/.Xdefaults or $HOME/.Xresources
              typical location of user's X resource configuration

AUTHOR
       The  uterm  script  is  an auxiliary script packaged with the
       mined editor by Thomas Wolff.  Please send comments,  sugges‐
       tions, bug reports to mined@towo.net.

uterm                        April 2009                     uterm(1)
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