Re: awk pipe and system call

On 28 Mrz., 16:59, "uwc...@[EMAIL PROTECTED]
" <uwc...@[EMAIL PROTECTED]
> wrote:
> i have two problems with awk:
>
> first, the following works on my system, which shows system usage
>
> =A0 =A0 iostat 2 | awk '{print $1}'
>
> However, the following seems never gets written to the log file
>
> =A0 =A0 =A0 =A0iostat 2 | awk '{print $1}' =A0> log
>
Try this instead:

iostat 2|awk '{system("echo " $1 " >>log")}'

(tested and works)

> Second problem is that I found it is impossible to send variables to
> system calls:
> the following works inside awk script:
>
> =A0 =A0 =A0 =A0system( "echo " $0);
>
> However, the following never works:
>
> =A0 =A0 =A0 BEGIN{ myvar1=3D0;}
> =A0 =A0 =A0 { myvar2 =3D1;
> =A0 =A0 =A0 =A0 system("echo " $myvar1 =A0$myvar2);
>
> Any ideas? thanks a bunch

awk doesn't support "$" before variable names. Try the following:

system("echo " myvar1 myvar2)

(tested and works)

Have a nice day
Robert