How to run an infinite loop program on startup on a raspberry pi without halting boot up
I have a shell script:
#!/bin/bash
while sudo /home/pi/MyCode; do :; done
echo Error with MyCode
which runs a program in an infinite loop. I want to set up the shell script to run at start-up (which I've done with other bash scripts). However, I don't want the script to halt start-up, or prevent me from being to ssh in.
I've seen a lot of people who have had to wipe and remount their SD cards due to infinite loops be created on start-up. How do I prevent this?
I've tried augmenting the code:
#!/bin/bash
while sudo /home/pi/MyCode &; do :; done
echo Error with MyCode
to run MyCode in the background, but I keep getting an error along the lines
unexpected character before ;
Is there a way to run this script on startup without halting my startup? If so, can it be done in a way that I still have the option of SSH'ing and stopping the script at any time?
linux shell script raspberry-pi infinite-loop
edited Sep 18 '14 at 20:34
Scott
15.8k113990
asked Sep 18 '14 at 20:16
JRogerCJRogerC
111
add a comment |
I have a shell script:
#!/bin/bash
while sudo /home/pi/MyCode; do :; done
echo Error with MyCode
which runs a program in an infinite loop. I want to set up the shell script to run at start-up (which I've done with other bash scripts). However, I don't want the script to halt start-up, or prevent me from being to ssh in.
I've seen a lot of people who have had to wipe and remount their SD cards due to infinite loops be created on start-up. How do I prevent this?
I've tried augmenting the code:
#!/bin/bash
while sudo /home/pi/MyCode &; do :; done
echo Error with MyCode
to run MyCode in the background, but I keep getting an error along the lines
unexpected character before ;
Is there a way to run this script on startup without halting my startup? If so, can it be done in a way that I still have the option of SSH'ing and stopping the script at any time?
linux shell script raspberry-pi infinite-loop
edited Sep 18 '14 at 20:34
Scott
15.8k113990
asked Sep 18 '14 at 20:16
JRogerCJRogerC
111
I'm not sure i understand the question. I don't have a ' before the #!. #!/bin/bash is the fist line of my bash script.
– JRogerC
Sep 18 '14 at 21:25
I made a type. I meant a/, which appears to be gone now anyway.
– lzam
Sep 18 '14 at 21:26
add a comment |
I have a shell script:
#!/bin/bash
while sudo /home/pi/MyCode; do :; done
echo Error with MyCode
which runs a program in an infinite loop. I want to set up the shell script to run at start-up (which I've done with other bash scripts). However, I don't want the script to halt start-up, or prevent me from being to ssh in.
I've seen a lot of people who have had to wipe and remount their SD cards due to infinite loops be created on start-up. How do I prevent this?
I've tried augmenting the code:
#!/bin/bash
while sudo /home/pi/MyCode &; do :; done
echo Error with MyCode
to run MyCode in the background, but I keep getting an error along the lines
unexpected character before ;
Is there a way to run this script on startup without halting my startup? If so, can it be done in a way that I still have the option of SSH'ing and stopping the script at any time?
linux shell script raspberry-pi infinite-loop
edited Sep 18 '14 at 20:34
Scott
15.8k113990
asked Sep 18 '14 at 20:16
JRogerCJRogerC
111
I have a shell script:
#!/bin/bash
while sudo /home/pi/MyCode; do :; done
echo Error with MyCode
which runs a program in an infinite loop. I want to set up the shell script to run at start-up (which I've done with other bash scripts). However, I don't want the script to halt start-up, or prevent me from being to ssh in.
I've seen a lot of people who have had to wipe and remount their SD cards due to infinite loops be created on start-up. How do I prevent this?
I've tried augmenting the code:
#!/bin/bash
while sudo /home/pi/MyCode &; do :; done
echo Error with MyCode
to run MyCode in the background, but I keep getting an error along the lines
unexpected character before ;
Is there a way to run this script on startup without halting my startup? If so, can it be done in a way that I still have the option of SSH'ing and stopping the script at any time?
linux shell script raspberry-pi infinite-loop
linux shell script raspberry-pi infinite-loop
edited Sep 18 '14 at 20:34
Scott
15.8k113990
asked Sep 18 '14 at 20:16
JRogerCJRogerC
111
edited Sep 18 '14 at 20:34
Scott
15.8k113990
asked Sep 18 '14 at 20:16
JRogerCJRogerC
111
edited Sep 18 '14 at 20:34
Scott
15.8k113990
edited Sep 18 '14 at 20:34
Scott
15.8k113990
edited Sep 18 '14 at 20:34
Scott
15.8k113990
15.8k113990
asked Sep 18 '14 at 20:16
JRogerCJRogerC
111
asked Sep 18 '14 at 20:16
JRogerCJRogerC
111
asked Sep 18 '14 at 20:16
JRogerCJRogerC
111
111
I'm not sure i understand the question. I don't have a ' before the #!. #!/bin/bash is the fist line of my bash script.
– JRogerC
Sep 18 '14 at 21:25
I made a type. I meant a/, which appears to be gone now anyway.
– lzam
Sep 18 '14 at 21:26
add a comment |
I'm not sure i understand the question. I don't have a ' before the #!. #!/bin/bash is the fist line of my bash script.
– JRogerC
Sep 18 '14 at 21:25
I made a type. I meant a/, which appears to be gone now anyway.
– lzam
Sep 18 '14 at 21:26
I'm not sure i understand the question. I don't have a ' before the #!. #!/bin/bash is the fist line of my bash script.
– JRogerC
Sep 18 '14 at 21:25
I'm not sure i understand the question. I don't have a ' before the #!. #!/bin/bash is the fist line of my bash script.
– JRogerC
Sep 18 '14 at 21:25
I made a type. I meant a
/, which appears to be gone now anyway.– lzam
Sep 18 '14 at 21:26
I made a type. I meant a
/, which appears to be gone now anyway.– lzam
Sep 18 '14 at 21:26
add a comment |
2 Answers
2
active
oldest
votes
Remove the :
It generates the syntax error. Alternatively insert a sleep 1 or something similar instead of it, bash can freak out on empty while ... do loops. If you go with this approach you shoukd also lose the &
If you leave it in you will create a new process for every iteration of the loop, grinding your pi to a halt once all your ram is taken.
Also use ./myCode.sh or exec myCode.sh to be shure it actually runs the script.
If you are running raspbian i would also suggest using upstart. This allows for a more controlled way of triggering stuff during boot, like only run once the filesystem is available.
Maybe post the code you want to run also, i can check if there are no other errors. Good for my bash-fu training :-)
answered Sep 18 '14 at 21:03
JakeJake
343212
I had this code running for 36 hours straight without error, so I don't think the : is giving me any problems. However, the code is driving an external piece of hardware, and giving it a second of rest would not be a bad thing.
– JRogerC
Sep 18 '14 at 21:24
add a comment |
Put the loop in its own script, running in the background:
startup script:
#!/bin/bash
mainloop.sh &
echo Should get here
mainloop.sh:
#!/bin/bash
while sudo /home/pi/MyCode; do :; done
There's probably a way to do this in one script, I'm not familiar enough with Bash to do it though.
answered Oct 27 '14 at 14:24
baochanbaochan
88968
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Remove the :
It generates the syntax error. Alternatively insert a sleep 1 or something similar instead of it, bash can freak out on empty while ... do loops. If you go with this approach you shoukd also lose the &
If you leave it in you will create a new process for every iteration of the loop, grinding your pi to a halt once all your ram is taken.
Also use ./myCode.sh or exec myCode.sh to be shure it actually runs the script.
If you are running raspbian i would also suggest using upstart. This allows for a more controlled way of triggering stuff during boot, like only run once the filesystem is available.
Maybe post the code you want to run also, i can check if there are no other errors. Good for my bash-fu training :-)
answered Sep 18 '14 at 21:03
JakeJake
343212
I had this code running for 36 hours straight without error, so I don't think the : is giving me any problems. However, the code is driving an external piece of hardware, and giving it a second of rest would not be a bad thing.
– JRogerC
Sep 18 '14 at 21:24
add a comment |
Remove the :
It generates the syntax error. Alternatively insert a sleep 1 or something similar instead of it, bash can freak out on empty while ... do loops. If you go with this approach you shoukd also lose the &
If you leave it in you will create a new process for every iteration of the loop, grinding your pi to a halt once all your ram is taken.
Also use ./myCode.sh or exec myCode.sh to be shure it actually runs the script.
If you are running raspbian i would also suggest using upstart. This allows for a more controlled way of triggering stuff during boot, like only run once the filesystem is available.
Maybe post the code you want to run also, i can check if there are no other errors. Good for my bash-fu training :-)
answered Sep 18 '14 at 21:03
JakeJake
343212
I had this code running for 36 hours straight without error, so I don't think the : is giving me any problems. However, the code is driving an external piece of hardware, and giving it a second of rest would not be a bad thing.
– JRogerC
Sep 18 '14 at 21:24
add a comment |
Remove the :
It generates the syntax error. Alternatively insert a sleep 1 or something similar instead of it, bash can freak out on empty while ... do loops. If you go with this approach you shoukd also lose the &
If you leave it in you will create a new process for every iteration of the loop, grinding your pi to a halt once all your ram is taken.
Also use ./myCode.sh or exec myCode.sh to be shure it actually runs the script.
If you are running raspbian i would also suggest using upstart. This allows for a more controlled way of triggering stuff during boot, like only run once the filesystem is available.
Maybe post the code you want to run also, i can check if there are no other errors. Good for my bash-fu training :-)
answered Sep 18 '14 at 21:03
JakeJake
343212
Remove the :
It generates the syntax error. Alternatively insert a sleep 1 or something similar instead of it, bash can freak out on empty while ... do loops. If you go with this approach you shoukd also lose the &
If you leave it in you will create a new process for every iteration of the loop, grinding your pi to a halt once all your ram is taken.
Also use ./myCode.sh or exec myCode.sh to be shure it actually runs the script.
If you are running raspbian i would also suggest using upstart. This allows for a more controlled way of triggering stuff during boot, like only run once the filesystem is available.
Maybe post the code you want to run also, i can check if there are no other errors. Good for my bash-fu training :-)
answered Sep 18 '14 at 21:03
JakeJake
343212
edited Sep 18 '14 at 21:27
answered Sep 18 '14 at 21:03
JakeJake
343212
answered Sep 18 '14 at 21:03
JakeJake
343212
answered Sep 18 '14 at 21:03
JakeJake
343212
343212
I had this code running for 36 hours straight without error, so I don't think the : is giving me any problems. However, the code is driving an external piece of hardware, and giving it a second of rest would not be a bad thing.
– JRogerC
Sep 18 '14 at 21:24
add a comment |
I had this code running for 36 hours straight without error, so I don't think the : is giving me any problems. However, the code is driving an external piece of hardware, and giving it a second of rest would not be a bad thing.
– JRogerC
Sep 18 '14 at 21:24
I had this code running for 36 hours straight without error, so I don't think the : is giving me any problems. However, the code is driving an external piece of hardware, and giving it a second of rest would not be a bad thing.
– JRogerC
Sep 18 '14 at 21:24
I had this code running for 36 hours straight without error, so I don't think the : is giving me any problems. However, the code is driving an external piece of hardware, and giving it a second of rest would not be a bad thing.
– JRogerC
Sep 18 '14 at 21:24
add a comment |
Put the loop in its own script, running in the background:
startup script:
#!/bin/bash
mainloop.sh &
echo Should get here
mainloop.sh:
#!/bin/bash
while sudo /home/pi/MyCode; do :; done
There's probably a way to do this in one script, I'm not familiar enough with Bash to do it though.
answered Oct 27 '14 at 14:24
baochanbaochan
88968
add a comment |
Put the loop in its own script, running in the background:
startup script:
#!/bin/bash
mainloop.sh &
echo Should get here
mainloop.sh:
#!/bin/bash
while sudo /home/pi/MyCode; do :; done
There's probably a way to do this in one script, I'm not familiar enough with Bash to do it though.
answered Oct 27 '14 at 14:24
baochanbaochan
88968
add a comment |
Put the loop in its own script, running in the background:
startup script:
#!/bin/bash
mainloop.sh &
echo Should get here
mainloop.sh:
#!/bin/bash
while sudo /home/pi/MyCode; do :; done
There's probably a way to do this in one script, I'm not familiar enough with Bash to do it though.
answered Oct 27 '14 at 14:24
baochanbaochan
88968
Put the loop in its own script, running in the background:
startup script:
#!/bin/bash
mainloop.sh &
echo Should get here
mainloop.sh:
#!/bin/bash
while sudo /home/pi/MyCode; do :; done
There's probably a way to do this in one script, I'm not familiar enough with Bash to do it though.
answered Oct 27 '14 at 14:24
baochanbaochan
88968
answered Oct 27 '14 at 14:24
baochanbaochan
88968
answered Oct 27 '14 at 14:24
baochanbaochan
88968
answered Oct 27 '14 at 14:24
baochanbaochan
88968
88968
add a comment |
add a comment |
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I'm not sure i understand the question. I don't have a ' before the #!. #!/bin/bash is the fist line of my bash script.
– JRogerC
Sep 18 '14 at 21:25
I made a type. I meant a
/, which appears to be gone now anyway.– lzam
Sep 18 '14 at 21:26