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Old 09-25-2011, 12:01 AM   #1
metalhawk
LQ Newbie
 
Registered: Sep 2011
Posts: 2

Rep: Reputation: Disabled
Unhappy Cannot run background process on Amazon Linux Instance, but runs on MAC OS X


Hello All,
Kindly review this situation.

I cannot run a background process in Amazon Linux instance, but The same runs on Mac OS X

Following is what happens
[root@someIp somePath]# php /path/to/myPhpScript.php arg1 arg2 arg3 > /dev/null 2>log.txt &
[1] 17849

[root@someIp somePath]# jobs
[1]+ Stopped php /path/to/myPhpScript.php arg1 arg2 arg3 > /dev/null 2>log.txt

[root@someIp somePath]# bg 1
[1]+ php /path/to/myPhpScript.php arg1 arg2 arg3 > /dev/null 2>log.txt &

[1]+ Stopped php /path/to/myPhpScript.php arg1 arg2 arg3 > /dev/null 2>log.txt

[root@someIp somePath]#

--------------------
But if I run without & it completes fine.

[root@someIp somePath]# php /path/to/myPhpScript.php arg1 arg2 arg3
Prints some output...
Prints some output...
Prints some output...
Prints some output...
Done...
[root@someIp somePath]#

--------
Any Help/suggestions will be of great help.

Thank You.
 
Old 09-25-2011, 12:30 AM   #2
metalhawk
LQ Newbie
 
Registered: Sep 2011
Posts: 2

Original Poster
Rep: Reputation: Disabled
I figured it out myself.

For some reason, It is being stopped becos it thinks it requires some kind of input from the keyboard.
As:
0 : Standard Input (Generally the Keyboard)
1 : Standard Output (Generally the Monitor)
2 : Standard Error

So I added the standard input to read from /dev/null.

I modified my cmd as follows:
[root@someIp somePath]# php /path/to/myPhpScript.php arg1 arg2 arg3 0</dev/null 1 >/dev/null 2>log.txt &
OR
[root@someIp somePath]# php /path/to/myPhpScript.php arg1 arg2 arg3 </dev/null >/dev/null 2>log.txt &

Thanks!
 
  


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