* [9fans] Duff's rc paper: Why awk?
@ 2013-06-07 13:02 markus schnalke
2013-06-07 13:18 ` erik quanstrom
0 siblings, 1 reply; 4+ messages in thread
From: markus schnalke @ 2013-06-07 13:02 UTC (permalink / raw)
To: 9fans
Hoi,
I've read [0], which is enlightening btw, but there is one thing,
in Section 27, which I don't understand: Why is awk(1) used there?
fn read{
$1=`{awk '{print;exit}'}
}
[0] http://static.tobold.org/rc/rc-duff.html
I rather would have used sed(1), which is less distracting in this
case:
fn read{
$1=`{sed q}
}
This use of awk is unexpected to me, it draws my attention on it,
thus I'm searching for the strange hidden detail that might be
emphasized. (Such as the use of `if not' instead of `else'.) But I
can't find it.
Maybe there is no such hidden detail. Maybe there is no real
reason behind the use of awk here. I'm not really sure ...
meillo
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] Duff's rc paper: Why awk?
2013-06-07 13:02 [9fans] Duff's rc paper: Why awk? markus schnalke
@ 2013-06-07 13:18 ` erik quanstrom
2013-06-11 12:24 ` Rudolf Sykora
0 siblings, 1 reply; 4+ messages in thread
From: erik quanstrom @ 2013-06-07 13:18 UTC (permalink / raw)
To: 9fans
> I've read [0], which is enlightening btw, but there is one thing,
> in Section 27, which I don't understand: Why is awk(1) used there?
>
> fn read{
> $1=`{awk '{print;exit}'}
> }
>
> [0] http://static.tobold.org/rc/rc-duff.html
>
> I rather would have used sed(1), which is less distracting in this
> case:
>
> fn read{
> $1=`{sed q}
> }
>
> This use of awk is unexpected to me, it draws my attention on it,
> thus I'm searching for the strange hidden detail that might be
> emphasized. (Such as the use of `if not' instead of `else'.) But I
> can't find it.
>
> Maybe there is no such hidden detail. Maybe there is no real
> reason behind the use of awk here. I'm not really sure ...
plan 9 sed reads a second line before quitting (note the "def" in the example
below); sed does not work.
- erik
------
; fn read{
$1=`{sed q}
echo read `{whatis $1}
}
; read x
abc
def
read x=abc
; fn read{
$1=`{awk '{print;exit}'}
echo read `{whatis $1}
}
; read x
abc
read x=abc
^ permalink raw reply [flat|nested] 4+ messages in thread
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2013-06-07 13:02 [9fans] Duff's rc paper: Why awk? markus schnalke
2013-06-07 13:18 ` erik quanstrom
2013-06-11 12:24 ` Rudolf Sykora
2013-06-11 15:38 ` markus schnalke
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