How to download code to Raspberry Pi to execute at start

[miaomiao]

Hi, I am using Raspberry Pi2. And I encountered problem to put code into Raspberry pi,it could work properly in the terminal with LCD on. But if I want Raspberry Pi execute automatically at startup without I click " compile" "make". I tried this five methods still could not work. https://www.dexterindustries.com/howto/ ... t-startup/ Does anyone know how to do? Thank you very much.

[lmarmisa]

If you wish to run automatically CLI commands or scripts (bash, python, etc) at startup, crontab should work fine.

I do not understand your comment related to compile and make.

When you compile a program, you generate an executable program which is ready to run. You will not need to recompile it again except if you have modified its source code.

So, you have no need to recompile a program after a reboot or something like that. Simply you have to call the executable file previously generated. If you use crontab -e, add a line like this:

Code: Select all

@reboot /my_path/my_exec_file_or_script opt_parms_here

[gkaiseril]

You need to make sure the script file you are trying to run has "execute" permission.

You can add that permission y using the chmod command

chmod +x myScriptFileName

Replace "myScriptFileName" with the file name of the bash script or other script you are trying to execute.

[miaomiao]

If you wish to run automatically CLI commands or scripts (bash, python, etc) at startup, crontab should work fine.

I do not understand your comment related to compile and make.

When you compile a program, you generate an executable program which is ready to run. You will not need to recompile it again except if you have modified its source code.

So, you have no need to recompile a program after a reboot or something like that. Simply you have to call the executable file previously generated. If you use crontab -e, add a line like this:

Code: Select all

@reboot /my_path/my_exec_file_or_script opt_parms_here

Hi, I have tried so many times.still could not make it. I am using a laser scanner with Raspberry Pi2. It could work perfectly until I set to auto run at startup. It would hang there.

[RaTTuS]

how do you start it when you are running normally ?
i.e.
what command do you type from where ?
what do you click
what do you need to do to get it to run now?

[miaomiao]

how do you start it when you are running normally ?
i.e.
what command do you type from where ?
what do you click
what do you need to do to get it to run now?

I ran it normally by pi@raspberrypi: sudo ./get_distance
Now I am trying to auto run it when power on by pi@raspberrypi: sudo nano /etc/rc.local then key in my path

But it will hang somewhere,could not execute the program.

[jahboater]

how do you start it when you are running normally ?
i.e.
what command do you type from where ?
what do you click
what do you need to do to get it to run now?

I ran it normally by pi@raspberrypi: sudo ./get_distance
Now I am trying to auto run it when power on by pi@raspberrypi: sudo nano /etc/rc.local then key in my path

But it will hang somewhere,could not execute the program.

When a program is run from rc.local it runs as root, so sudo is not required.
I would add some trace into the program (to a file) and see whats going on.

[RaTTuS]

easiest for you would be get your rpi to auto log on to a commanline session and edit
.bashrc and put

Code: Select all

if [ $(tty) == /dev/tty1 ]; then
   sudo ./get_distance
fi

at the end,
if your program does not need keyboard input or display then I'd stuff it at the end of rc.local &
however
personally I'd run a systemd service and stuff it on a spare virtual terminal like viewtopic.php?f=29&t=7192&start=25#p898424 sor of thing [I do need to edit those instructions as I understand systemd a lot more now then when I wrote them [they should work though]