Re: Shell Golf

[Danny Sauer <cloudmaster@cloudmaster.com>]

You could prune about 5 chars off by using an END block and the -n 
switch, and get another two by removing the quotes around the array 
(though the quotes give you prettier output).  You get 2 more chars by 
calling length with no args, since it defaults to $_.  One more comes 
from bumping the array up next to the print command.  We're down to 64 
if you put the command right next to the -e switch and use "warn" 
instead of print. :)

perl -ne'$x=length;@n=($x,$ARGV,$_)if$x>$n[0];END{warn@n}' *.pl

I was trying to find a way to put the string into $@ so warn can be 
called without args, but it's just not presenting itself (and I should 
really be doing real work while I'm at work).  "die" would be nice, but 
it prints a mess if the string passed doesn't end with "\n"...

--Danny, dissapointed that split/./ is more chars than length, since 
that's a far more entertaining way to find the length of $_ :)

Steven Pritchard wrote:

> On Wed, May 07, 2003 at 06:46:41PM +0000, mike808@users.sourceforge.net wrote:
> 
>>My solution clocks in at a hefty *59* characters. Any contenders?
>>
>>perl -p -e '$_=length($_)." $ARGV $_"' *.pl|sort -n|tail -1
> 
> 
> Not as short, but a heck of a lot more efficient:
> 
>   perl -e 'while(<>){$x=length$_;@n=($x,$ARGV,$_)if$x>$n[0]}print"@n"' *.pl
> 
> 1000 runs of the original:
> 
>   8.25user 7.59system 0:16.40elapsed 96%CPU (0avgtext+0avgdata 0maxresident)k
>   0inputs+0outputs (567238major+175905minor)pagefaults 0swaps
> 
> 1000 runs of my script:
> 
>   5.24user 3.53system 0:09.61elapsed 91%CPU (0avgtext+0avgdata 0maxresident)k
>   0inputs+0outputs (316240major+71180minor)pagefaults 0swaps
> 
> This is in a directory with 9 .pl files with a total of 355 lines, so
> the difference is *much* larger with more/bigger files.  Here's a
> directory with 9 .c files with a total of 3868 lines:
> 
> Original:
> 
>   38.51user 11.17system 0:52.86elapsed 93%CPU (0avgtext+0avgdata 0maxresident)k
>   0inputs+0outputs (567238major+234930minor)pagefaults 0swaps
> 
> Mine:
> 
>   9.26user 3.87system 0:16.95elapsed 77%CPU (0avgtext+0avgdata 0maxresident)k
>   0inputs+0outputs (316240major+71195minor)pagefaults 0swaps
> 
> And to get really crazy, I tried the same thing *once* on an old-ish
> copy of XFree86 that I happened to have lying around (only on *.h
> though, otherwise the argument list was too long ;):
> 
> Original:
> 
>   9.67user 1.78system 0:12.29elapsed 93%CPU (0avgtext+0avgdata 0maxresident)k
>   0inputs+0outputs (908major+9030minor)pagefaults 0swaps
> 
> Mine:
> 
>   1.11user 0.24system 0:01.51elapsed 89%CPU (0avgtext+0avgdata 0maxresident)k
>   0inputs+0outputs (655major+436minor)pagefaults 0swaps
> 
> That's on 569644 lines in 2294 files.
> 
> Steve


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