[Gnuplot-info] $(gnuplot --version) don't work

[only4 <onl...@ka...>]

I want to obtain the version string of gnuplot and get is in a shell script
variable, but I get an error trying the common VERSION=$(gnuplot --version)
Ps: My goal is write some lines of shell script that uses "filledcurves"
only if Gnuplot is >=4, "lines" otherwise