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   groff    ( 1 )

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Окружение (Environment)

Normally, the path separator in the following environment
       variables is the colon; this may vary depending on the operating
       system.  For example, DOS and Windows use a semicolon instead.

       GROFF_BIN_PATH
              This search path, followed by PATH, is used for commands
              that are executed by groff.  If it is not set then the
              directory where the groff binaries were installed is
              prepended to PATH.

       GROFF_COMMAND_PREFIX
              When there is a need to run different roff implementations
              at the same time groff provides the facility to prepend a
              prefix to most of its programs that could provoke name
              clashings at run time (default is to have none).
              Historically, this prefix was the character g, but it can
              be anything.  For example, gtroff stood for groff's troff,
              gtbl for the groff version of tbl.  By setting
              GROFF_COMMAND_PREFIX to different values, the different
              roff installations can be addressed.  More exactly, if it
              is set to prefix xxx then groff as a wrapper program
              internally calls xxxtroff instead of troff.  This also
              applies to the preprocessors eqn, grn, pic, refer, tbl,
              soelim, and to the utilities indxbib and lookbib.  This
              feature does not apply to any programs different from the
              ones above (most notably groff itself) since they are
              unique to the groff package.

       GROFF_ENCODING
              The value of this environment value is passed to the
              preconv preprocessor to select the encoding of input
              files.  Setting this option implies groff's command-line
              option -k (this is, groff actually always calls preconv).
              If set without a value, groff calls preconv without
              arguments.  An explicit -K command-line option overrides
              the value of GROFF_ENCODING.  See preconv(1) for details.

       GROFF_FONT_PATH
              A list of directories in which to seek the selected output
              device's directory of device and font description files.
              See troff(1) and groff_font(5).

       GROFF_TMAC_PATH
              A list of directories in which to seek macro files.  See
              troff(1) and groff_tmac(5).

       GROFF_TMPDIR
              The directory in which temporary files are created.  If
              not set, but the environment variable TMPDIR is set,
              temporary files are created there instead.  On MS-DOS and
              Windows platforms, if neither of the foregoing are set,
              the environment variables TMP and TEMP (in that order) are
              checked also.  Otherwise, temporary files are created in
              /tmp.  The refer(1), grohtml(1), and grops(1) commands use
              temporary files.

       GROFF_TYPESETTER
              Set the default output device.  If empty or not set, 'ps'
              is used.  The -T option overrides GROFF_TYPESETTER.

       SOURCE_DATE_EPOCH
              A timestamp (expressed as seconds since the Unix epoch) to
              use as the creation timestamp in place of the current
              time.  The time is converted to human-readable form using
              ctime(3) when the formatter starts up and stored in
              registers usable by documents and macro packages.

       TZ     The time zone to use when converting the current time (or
              value of SOURCE_DATE_EPOCH) to human-readable form; see
              tzset(3).