Re: How to get an error in piped getline?

[Wolfgang Laun]

One might test the existence (and other properties) of the file using
system() and use getline on the pipe only if it looks safe:

   exit_code = system( "test -r noexist.gz " );

-W

On Sat, 26 Feb 2022 at 05:33, Peng Yu <pengyu.ut@gmail.com> wrote:

> $ awk -e 'BEGIN { exit_code = "zcat noexist.gz" | getline; print
> exit_code, "|" $0 "|"}'
> gzip: noexist.gz: No such file or directory
> 0 ||
>
> https://www.gnu.org/software/gawk/manual/html_node/Getline_002fPipe.html
>
> It is not clear how the error in a pipe is supposed to be dealt with
> in awk. Is there a way to get the error in the external program called
> in the pipe? Thanks.
>
> --
> Regards,
> Peng
>
>

-- 
Wolfgang Laun