[lug] Bash Scripting Ping

[D. Stimits]

> On 11/08/2020 4:57 PM David L. Willson <dlwillson at thegeek.nu> wrote:
> 
>  
> I finally got a chance to play with this.
> 
> For me, these worked:
> - ping yahoo.com | while read PINGLINE; do echo pingline $PINGLINE; done
> - ping -O -D yahoo.com | while read PINGLINE; do echo pingline $PINGLINE; done
> 
> I tested Fedora natively, and debian, ubuntu, and opensuse/leap in Docker.
> 
> I didn't need to kill any buffering anywhere, so I'm curious about where/when that is needed. I also wonder whether doing it in Docker somehow invalidates the results. I also also wonder whether doing it in Docker is a good way for my macOS-loving friends to get around the limitations of their preferred OS. ;-)

Buffering will never change the result. All it will change is the timing of the result. Buffering allows greater "average" throughput in a multitasking environment, but with ping being a "comment on packet timing", non-buffered is closer to actual timing. Just thinking about ping as a "realtime heartbeat" of packets, it just seems non-buffered is closer to actual timing, and that the data throughput is so little buffering will never improve performance anyway.

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