tdn@barbera) (14-03-18 13:55) (P:0 L:1) [0]
~ $ gnuplot                                                                                                                                                                          [R0 J0 L:0.30 0.29 0.32 U:0+00:32 pts/9 1329H]

        G N U P L O T
        Version 4.6 patchlevel 3    last modified 2013-04-12 
        Build System: Linux x86_64

        Copyright (C) 1986-1993, 1998, 2004, 2007-2013
        Thomas Williams, Colin Kelley and many others

        gnuplot home:     http://www.gnuplot.info
        faq, bugs, etc:   type "help FAQ"
        immediate help:   type "help"  (plot window: hit 'h')

Terminal type set to 'unknown'
gnuplot> ^D
(tdn@barbera) (14-03-18 13:55) (P:0 L:1) [0]
~ $                                                                                                                                                                                  [R0 J0 L:0.30 0.29 0.32 U:0+00:32 pts/9 1330H]
(tdn@barbera) (14-03-18 13:55) (P:0 L:1) [1]
~ $ echo "plot sin(x)" | gnuplot -persist                                                                                                                                            [R1 J0 L:0.28 0.29 0.32 U:0+00:32 pts/9 1330H]
(tdn@barbera) (14-03-18 13:55) (P:0 L:1) [0]
~ $