Script to run non-stop

Raynon · #1 (**permalink**) 11-06-2007

Hi All,

I am on a Solaris OS and i have come up with a csh script named " mycshscript " which will grab data from a datalog file & format the grabbed data & upload formated version to web server. I would want to have this script to run non-stop so that the latest can be captured since data is always appending to the datalog file. Below is a skeleton of my script using a while loop to loop non-stop.

My question is that
1) Does closing my command console stop the running of my script?
2) If i want to stop my script from running, how am i able to do it in a clean manner?

Code:

#!/bin/csh

set num = 1

while ($num == 1)

......
.......

end

porter · #2 (**permalink**) 11-06-2007

Quote:

Originally Posted by Raynon

Does closing my command console stop the running of my script?

Normally.

The traditional solution is

Code:

nohup myprogram &

and run it from a shell without job control.

This will

(a) run the program in the background
(b) ignore any SIGHUP generated by the terminal "hanging up".

Raynon · #3 (**permalink**) 11-06-2007

Hi Porter,

1) How do i stop the process if i need to?
2) how do i need to create a while loop for this ?
3) If there's an echo command, will it be printed out ?
4) Do i need to add in the " nohup myprogram & >/dev/null 2>&1 " just like cronjob to remove all the echoing and printing command ?

matrixmadhan · #4 (**permalink**) 11-06-2007

Quote:

and run it from a shell without job control.

Not necessarily.

I could do the same with ' ksh / zsh ' - which has a good job control.

Would that create any difference ?

porter · #5 (**permalink**) 11-06-2007

Quote:

Originally Posted by matrixmadhan

Would that create any difference ?

Run it from a shell that when you try to exit the shell doesn't refuse because it complains you still have jobs running.

Quote:

Originally Posted by Raynon

3) What if there's no redirection operators ? What will happen ?

man nohup, typically end up with a file called "nohup.out".

Quote:

Originally Posted by Raynon

4) Can i use this ?
nohup myprogram & >/dev/null 2>&1

Sure, as always, give it a go, see what it does, try and break it.

matrixmadhan · #6 (**permalink**) 11-06-2007

Quote:

Run it from a shell that when you try to exit the shell doesn't refuse because it complains you still have jobs running.

I agree, that would not hinder the running process.

Its more like a warning and that could be very much ignored.

Raynon · #7 (**permalink**) 12-23-2007

Quote:

Originally Posted by porter

Run it from a shell that when you try to exit the shell doesn't refuse because it complains you still have jobs running.

man nohup, typically end up with a file called "nohup.out".

Sure, as always, give it a go, see what it does, try and break it.

Hi Porter,

If there's some mismatch in the input file which causes the script to output an error -> " Unrecognized command: ,$ p ". Will this be appended to the file "nohup.out" as well ?

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