Re: Detecting GNU sed

[Alexandre Oliva]

On Oct 31, 2000, Pavel Roskin <address@hidden> wrote:

> Hello, Alexandre!
>> > +(echo 'xyz-xY' | $sed 's/\bx.\b/XY/' | grep 'xyz-XY') >/dev/null 2>&1 ||

>> Use test "x`echo ... | $sed ...`" = "x..." instead.  Other than that,
>> ok.

> Search for the word "avoidable" in the documentation. It is exactly about
> what you are suggesting.

Indeed.  I recalled there was something about not using grep for this
kind of test in the docs, but I didn't recall we had decided for
case.  

> -$sed --version </dev/null >/dev/null 2>&1 ||
> -  { echo autoupdate requires GNU sed >&2; exit 77; }
> +case x`echo 'xyz-xY' | $sed 's/\bx.\b/XY/' 2>/dev/null` in
> +  xxyz-XY*);;
> +  *) echo autoupdate requires GNU sed >&2; exit 77 ;;
> +esac

Ok.  Thanks,
 
-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  address@hidden, redhat.com}
CS PhD student at IC-Unicamp        address@hidden, gnu.org}
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