<div dir="ltr">It should be geometry_msgs .. you missed the last 's'<div> rostopic pub -1 /turtle1/cmd_vel geometry_msgs/Twist -- '[2.0, 0.0, 0.0]' '[0.0, 0.0, 1.8]'<br></div></div><div class="gmail_extra">
<br clear="all"><div><div dir="ltr"><div><font color="#0b5394">Regards<br>Jit Ray Chowdhury<br></font></div><font color="#0b5394">Co-Founder | AuRo Robotics | <a href="http://www.aurobots.com" target="_blank">www.aurobots.com</a><br>
</font><div><div><div><font color="#0b5394">(+91) 98315-46599 / 91432-99599 | <a href="http://www.jitrc.com" target="_blank">www.jitrc.com</a></font></div></div></div></div></div>
<br><br><div class="gmail_quote">On Sat, Jul 12, 2014 at 4:31 AM, Davinci <span dir="ltr"><<a href="mailto:davinci_mgs@hotmail.com" target="_blank">davinci_mgs@hotmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span lang="EN-US">Hi all. I’m new in Ros, and needing
some help to follow the tutorials.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> When I type ( $ rostopic pub -1 /turtle1/cmd_vel
geometry_msg/Twist -- `[2.0, 0.0, 0.0]´ ´[0.0, 0.0, 1.8] )<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> The previous command sends a message to
turtlesim to move an linear velocity of 2.0 and an angular velocity of 1.8. <u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">I get this ( ERROR: invalid
message type: geometry_msg/Twist. )<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Anibody cam tel me where did I go wrong?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">I´m using ros hidro on ubuntu 12 lts, inside
a virtualbox vm.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> Thanks for all.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"> <u></u><u></u></span></p>
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<br></blockquote></div><br></div>