(groff.info)Environment

---

Next: Macro Directories Prev: Groff Options Up: Invoking groff

---

Enter node , (file) or (file)node

2.2 Environment
===============

There are also several environment variables (of the operating system,
not within `gtroff') which can modify the behavior of `groff'.

`GROFF_COMMAND_PREFIX'
     If this is set to X, then `groff' runs `Xtroff' instead of
     `gtroff'.  This also applies to `tbl', `pic', `eqn', `grn',
     `refer', and `soelim'.  It does not apply to `grops', `grodvi',
     `grotty', `pre-grohtml', `post-grohtml', `grolj4', and `gxditview'.

     The default command prefix is determined during the installation
     process.  If a non-GNU troff system is found, prefix `g' is used,
     none otherwise.

`GROFF_TMAC_PATH'
     A colon-separated list of directories in which to search for macro
     files (before the default directories are tried).  Note: Macro
     Directories.

`GROFF_TYPESETTER'
     The default output device.

`GROFF_FONT_PATH'
     A colon-separated list of directories in which to search for the
     `dev'NAME directory (before the default directories are tried).
     Note: Font Directories.

`GROFF_BIN_PATH'
     This search path, followed by `PATH', is used for commands executed
     by `groff'.

`GROFF_TMPDIR'
     The directory in which `groff' creates temporary files.  If this is
     not set and `TMPDIR' is set, temporary files are created in that
     directory.  Otherwise temporary files are created in a
     system-dependent default directory (on Unix and GNU/Linux systems,
     this is usually `/tmp').  `grops', `grefer', `pre-grohtml', and
     `post-grohtml' can create temporary files in this directory.

   Note that MS-DOS and MS-Windows ports of `groff' use semi-colons,
rather than colons, to separate the directories in the lists described
above.