Design a User-defined robot of your choice (or you can use the URDF file) and enable the LIDAR Scanner so that any obstacle placed on the path of the light scan will cut the light rays. Visualize the robot in the Gazebo workspace, and also show the demonstration in RViz. (NB: Gain knowledge on wiring URDF file and .launch file for enabling any user-defined robot to get launched in the gazebo platform.) SLAM : One of the most popular applications of ROS is SLAM(Simultaneous Localization and Mapping). The objective of the SLAM in mobile robotics is to construct and update the map of an unexplored environment with the help of the available sensors attached to the robot which will be used for exploring. URDF: Unified Robotics Description Format, URDF, is an XML specification used in academia and industry to model multibody systems such as robotic manipulator arms for manufacturing assembly lines and animatronic robots for amusement parks. URDF is especially popular with users of the Robo
Often you
come across a situation where you try to open a machine remotely using
ssh and try to start a server or a run a command indefinitely.
But once you close the ssh session, your session also terminates and the background process also terminates. So here is a solution.
To open ssh remotely,
prompt $] ssh username@machinename
Ex: ssh root@172.16.1.1
Ex: ssh root@example.com
prompt $] ssh -X username @machinename
Ex. ssh -X root@172.16.1.1
(this -X indicates the remote session can be opened in X window (GUI) mode)
Assume we need to start a httpd server in the remote machine.
we can issue the command like this
usage:
prompt$] nohup command
if any error or log information may be stored in the nohup.out file. if you want to redirect to a file use the redirected symbol (1> indicates standard output and 2> indicates standard Error). Specify the filenames for the output. Here is the typical nohup command to start the httpd server.
prompt $] nohup /etc/init.d/httpd start 1> file.out 2> file.err &
nohup is the command simply tells "no hangup". This will send the output to non-tty.
The above command will start the httpd server and any error or output will be written on to the files file.err and file.out respectively (The & indicates the background process that closes the current terminal and prompts for further inputs).
This command I learnt when i try to deploy Sage math libraries in a IBM Blade Server. We were really struggling to run the notebook in sagemath library. But finally accomplished using the nohup command.
The alternative to nohup is crontab or cronjob can be used.
T S Pradeep Kumar
But once you close the ssh session, your session also terminates and the background process also terminates. So here is a solution.
To open ssh remotely,
prompt $] ssh username@machinename
Ex: ssh root@172.16.1.1
Ex: ssh root@example.com
prompt $] ssh -X username @machinename
Ex. ssh -X root@172.16.1.1
(this -X indicates the remote session can be opened in X window (GUI) mode)
Assume we need to start a httpd server in the remote machine.
we can issue the command like this
usage:
prompt$] nohup command
if any error or log information may be stored in the nohup.out file. if you want to redirect to a file use the redirected symbol (1> indicates standard output and 2> indicates standard Error). Specify the filenames for the output. Here is the typical nohup command to start the httpd server.
prompt $] nohup /etc/init.d/httpd start 1> file.out 2> file.err &
nohup is the command simply tells "no hangup". This will send the output to non-tty.
The above command will start the httpd server and any error or output will be written on to the files file.err and file.out respectively (The & indicates the background process that closes the current terminal and prompts for further inputs).
 |
| nohup in Linux |
This command I learnt when i try to deploy Sage math libraries in a IBM Blade Server. We were really struggling to run the notebook in sagemath library. But finally accomplished using the nohup command.
The alternative to nohup is crontab or cronjob can be used.
T S Pradeep Kumar
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