### 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.