Source : http://www.shapeoko.com/forum/viewtopic.php?f=5&t=361&start=10#p3050
== C'est là que le fun commence ==
$ stty raw ignbrk 9600 < /dev/ttyUSB0
$ ( cat <&3 & cat >&3; kill %%) 3<>/dev/ttyUSB0
Grbl 0.8c ['$' for help]
$
$$ (view Grbl settings)
$# (view # parameters)
$G (view parser state)
$N (view startup blocks)
$x=value (save Grbl setting)
$Nx=line (save startup block)
$C (check gcode mode)
$X (kill alarm lock)
$H (run homing cycle)
~ (cycle start)
! (feed hold)
? (current status)
ctrl-x (reset Grbl)
ok
G21
ok
G91
ok
G1 X10 F200
ok
G1 X-10 F400
ok
$$
$0=7.273 (x, step/mm)
$1=7.273 (y, step/mm)
$2=400.000 (z, step/mm)
$3=30 (step pulse, usec)
$4=200.000 (default feed, mm/min)
$5=600.000 (default seek, mm/min)
$6=0 (step port invert mask, int:00000000)
$7=25 (step idle delay, msec)
$8=0.008 (acceleration, mm/sec^2)
$9=300.000 (junction deviation, mm)
$10=0.100 (arc, mm/segment)
$11=25 (n-arc correction, int)
$12=3 (n-decimals, int)
$13=0 (report inches, bool)
$14=1 (auto start, bool)
$15=0 (invert step enable, bool)
$16=0 (hard limits, bool)
$17=0 (homing cycle, bool)
$18=0 (homing dir invert mask, int:00000000)
$19=25.000 (homing feed, mm/min)
$20=250.000 (homing seek, mm/min)
$21=100 (homing debounce, msec)
$22=1.000 (homing pull-off, mm)
ok
$0=70
ok
G1 X10 F400
ok