The .XLOWER command allows you to control the case of index
    entries specified by the .INDEX and the .ENTRY commands, or by
    the Index flag (>). The case of the index entries will match
    exactly the case that you enter when you make the index entry.

    See also the .XUPPER command.

    Format

      .XLOWER

    Abreviated format

      .XL

1  –  Default

    If you do not specify the .XLOWER command, .XUPPER is the
    default.