Keywords: gildas-intro

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### Logical Names

All logical names are placed in a file named `.gag.dico` in your home directory `($HOME)`. The format of the `.gag.dico` file is

    LOGICAL_NAME1    equivalent_name1
    LOGICAL_NAME2:   Equivalent_Name2

where the logical names should always be in capital letters, while case matter for equivalent names. The ```:''` indicates that the logical name is a directory (pathname). Besides logical names which you can use to define special files, or directories, a few peculiar names are used to customize your GILDAS environment:

- `GAG_EDIT`
  the name of your preferred text editor (e.g. vi, emacs, vuepad, ved, ...). With an & at the end, it will be launched in background.
- `GAG_HARDCOPY`
  the default type you wish for graphic hardcopies in GREG. Major possibilities are

      EPS FAST      "Fast" grey-scale postscript
      EPS GREY      "Nice" grey-scale postscript (clipping more accurate)
      EPS COLOR      Color postscript
      HPGL           HP-GL language

  See GREG command `DEVICE` for details.
- `GAG_PRINTER`
  The (queue) name of the printer you prefer to use by default. Beware that it should be compatible with the description given in `GAG_HARDCOPY`. Funny results can be obtained sending HPGL commands to a PostScript printer.
- `GILDAS_LOCAL:`
  The path for your own GILDAS tasks. For advanced users only.
- `GAG_TMP:`
  A path where you whish to store temporary files which may be created by some applications. For optimum performance, use a local disk of the computer.

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