On Mon, 18 Jan 2021 13:20:59 +0000, Pancho wrote:

> I'm not sure what awk interactive/buffering means. Without the "-W
> interactive" flag awk doesn't just buffer output, the system() call is
> delayed too. It's more like it is buffering input.
>
Since you're using a pipe to pass messages from the log reader to the awk
program, awk makes a read request which will wait for input until either
a line of text is written to the pipe, in which case it gets read by awk
(awk reads lines, so the message MUST be terminated by a newline) OR the
pipe is closed, in which case awk gets an EOF and stops. If the awk
script contains a END action, this is executed before is quits.

The only apparent buffering you should see is due to awk waiting for the
newline that terminates the line being read.

About -W : according to the manpage for the awk version I'm using, 5.0.1,
-W has nothing to do with waiting for anything. All it does is to change
the option marker from - to --


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Martin    | martin at
Gregorie  | gregorie dot org

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