Hallo Randal,
Randal L. Schwartz <merlyn@xxxxxxxxxxxxxx> wrote:
>>>>>> "Jörg" == Jörg Sommer <joerg@xxxxxxxxxxxx> writes:
>
> Jörg> What about using a shell function and a *big* variable or an intermediate
> Jörg> file?
>
> What makes you think that's any more faster or efficient than calling Perl
> at this point?
Nothing. My intention was not the speed, but the dependency on Perl. But
your are right. Except from the point that my suggestion is broken, it's
*much* slower:
% time dash -c 'while IFS= read -r line; do rev="$line
$rev"; done; printf "%s" "$rev"' < gitk-git/gitk-wish DN
dash -c < gitk-git/gitk-wish > /dev/null 2> /dev/null 17,89s user 2,68s system 96% cpu 21,352 total
% time tac < gitk-git/gitk-wish DN
tac < gitk-git/gitk-wish > /dev/null 2> /dev/null 0,01s user 0,01s system 91% cpu 0,017 total
% time perl -e 'print reverse <>' < gitk-git/gitk-wish DN
perl -e 'print reverse <>' < gitk-git/gitk-wish > /dev/null 2> /dev/null 0,07s user 0,01s system 59% cpu 0,141 total
But I doubt this hurts, because we don't have such a big input.
% wc -l git.c
390 git.c
% time dash -c 'while IFS= read -r line; do rev="$line
$rev"; done; printf "%s" "$rev"' < git.c DN
dash -c < git.c > /dev/null 2> /dev/null 0,04s user 0,04s system 62% cpu 0,115 total
And what about something like this: 'tac || rev || perl …'
Bye, Jörg.
--
Was der Bauer nicht kennt, das frisst er nicht. Würde der Städter kennen,
was er frisst, er würde umgehend Bauer werden.
Oliver Hassencamp
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