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Korn Shell script in stopped state while running in background

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# 1  
Old 04-30-2015
HP Korn Shell script in stopped state while running in background
Hi,

I want to run a shell script in background .
but its going to stopped state


Code:
$ ksh cat_Duplicate_Records_Removal.ksh &
[2]     8975
$
[2] + Stopped (tty output)     ksh cat_Duplicate_Records_Removal.ksh &


why is this happening?

Also could anyone please tell me what is a stopped state and what is the use of it?
# 2  
Old 04-30-2015
It seems ksh doesn't ignore SIGTTOU, which is sent when a background process tries to write to a terminal. This question was just asked by alexcol Nohup Command gets status Stopped

Try redirecting to files ksh >stdout.log 2>stderr.log & or /dev/null
Also consider using nohup
This User Gave Thanks to neutronscott For This Post:
TomG
# 3  
Old 04-30-2015
Quote:
Originally Posted by neutronscott
It seems ksh doesn't ignore SIGTTOU, which is sent when a background process tries to write to a terminal. This question was just asked by alexcol Nohup Command gets status Stopped

Try redirecting to files ksh >stdout.log 2>stderr.log & or /dev/null
Also consider using nohup


Thank You..
but my script is not writing anything to the terminal(I have redirected all output to logfile).
I ran the script in foreground and it completed successfully without sending any output/error to the screen
Code:
$ ksh cat_Duplicate_Records_Removal.ksh
$

Is there any other reason why my script is stopped?
# 4  
Old 04-30-2015
Maybe nothing visible was sent to the stdout (usually the screen) but we can see inside to know for sure. Perhaps something prepares to write even though there is no actual output.

Can you share your code?



Robin
# 5  
Old 04-30-2015
maybe you can trap SIGTTOU and ignore it in your script...
maybe you can coerce the terminal not to send it: stty -tostop
# 6  
Old 04-30-2015
Quote:
Originally Posted by neutronscott
maybe you can trap SIGTTOU and ignore it in your script...
maybe you can coerce the terminal not to send it: stty -tostop


ok i ran the script in background

Code:
$ nohup ksh cat_Duplicate_Records_Removal.ksh >/dev/null 2>&1 &
[1]     6679
$ exit
You have running jobs
[1] + Stopped (tty output)     nohup ksh cat_Duplicate_Records_Removal.ksh >/dev/null 2>&1 &
$

now the problem is when i type exit, the job is getting stopped.
why is that?


Thank you
# 7  
Old 04-30-2015
It seems it's still suffering from the original problem. I wonder if redirecting stdin would help </dev/null.

disowning the process should allow you to exit cleanly. nohup ksh ... & disown
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