Re: "Cypher punks" display arrogance and stupidity in the new year

[ichudov@algebra.com (Igor Chudov @ home)]

Dr.Dimitri Vulis KOTM wrote:
> 
> ichudov@algebra.com (Igor Chudov @ home) writes:
> 
> > Dr.Dimitri Vulis KOTM wrote:
> > >
> > > Here's a neat trick: if you want to list a file with line numbers, try:
> > >
> > > grep -n "^" file
> >
> > cat -n works faster.
> 
> Did you time it?
> 

Yes, I wrote a prog that quickly prints a specified number of lines
(see below). Then I piped the output of that program to cat -n and
grep, respectively, and here's what I got:

manifold::~/tmp==>./a.out 1000000 | /usr/bin/time cat -n > /dev/null
1.32user 0.05system 0:01.62elapsed 84%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (46major+17minor)pagefaults 0swaps

manifold::~/tmp==>./a.out 1000000 | /usr/bin/time grep -n '^' > /dev/null
19.75user 0.04system 0:20.71elapsed 95%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (88major+26minor)pagefaults 0swaps


The difference is about fifteen times.

	- Igor.


#include <stdio.h>

main( int argc, char *argv[] )
{

  int n = atoi( argv[1] );

  for( ; n; n-- )
    putchar( '\n' );
}