Currently (commit a8a8a8) the abbreviation of datafile subcommand for set/show commands is "data" (ref). Since it overlaps with the string "data" of data subcommand (ref), datafile subcommand is unable to be abbreviated (gnuplot utility fails with "unrecognized option"). I suggest defining a string "df" or "datf" as the abbreviation of datafile subcommand. -{ "data$file", S_DATAFILE }, +{ "datafile", S_DATAFILE }, +{ "df", S_DATAFILE },