Ampersand not giving back the control (Korn shell)
OS version : AIX 6.1
Shell : Korn
When you 'postfix' a command with ampersand (&) , it is supposed to run in the background and give you back the control.
I tested this with ping command (by default it pings every 1 second )
After I ran the below ping command with ampersand, I pressed enter and I got the $ prompt. But when I was about type the next command, the ping output keeps coming to prompt and I can't type anything.
To stop the execution , I tried Ctrl+z and Ctrl + C . But neither of them worked
Code:
[glxavr214]/$ ping glxavr196 &
[1] 29688082
[glxavr214]/$ PING glxavr196.qualx.net (169.165.0.114): 56 data bytes
64 bytes from 169.165.0.114: icmp_seq=0 ttl=255 time=0 ms
64 bytes from 169.165.0.114: icmp_seq=1 ttl=255 time=0 ms
64 bytes from 169.165.0.114: icmp_seq=2 ttl=255 time=0 ms
[glxavr214]/$ 64 bytes from 169.165.0.114: icmp_seq=3 ttl=255 time=0 ms
s64 bytes from 169.165.0.114: icmp_seq=4 ttl=255 time=1 ms
ksh: s: not found
[glxavr214]/$ 64 bytes from 169.165.0.114: icmp_seq=5 ttl=255 time=4 ms
[glxavr214]/$ 64 bytes from 169.165.0.114: icmp_seq=6 ttl=255 time=0 ms
[glxavr214]/$ 64 bytes from 169.165.0.114: icmp_seq=7 ttl=255 time=0 ms
Why can't I get the control back at dollar prompt to run other commands?
Last edited by Scott; 03-01-2012 at 09:59 AM..
Reason: Code tags, please...
Also you if you want to use ping in a script I suggest this approach :
ping -c X <hostname>
where X is number of packages (one per second) you want to send to the rmeote server. To check the ping for a server for a certain time-frame I preffer this approach rather than ping sent to background and then kill the background process.
This User Gave Thanks to black_fender For This Post:
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03-01-2012
