Re: Re-done kernel archive - real one?

On Sun, Apr 17, 2005 at 01:26:27PM -0700, Linus Torvalds wrote:

On Sun, 17 Apr 2005, Russell King wrote:

quoted

It's trivial to change - it's either sort -n or sort -nr !

Yes.

Btw, it might make sense to do the "grep" before the sort, since the sort 
doesn't scale as nicely with lots of output. On the other hand, then the 
grep pattern needs to be a bit more complex (so that it doesn't pick up on 
things that have _parents_ with ":1"). I think the rev-tree output is 
obvious enough that it's pretty trivial to grep for..

sed works as well - in fact, we can use it to both select lines based
upon the :1 _and_ cut out the bulk of the stuff we're not interested in.
So:

rev-tree $to $prev | \
  sort -nr | cut -d' ' -f2 | grep :1 | cut -d: -f1

becomes:

rev-tree $to $prev | \
  sed -n 's,\([[:digit:]]\+\)[[:space:]]\+\([[:xdigit:]]\+\):1.*,\1 \2,p' | \
  sort -nr | cut -d' ' -f2

(appologies to those who don't like regexps 8))

One thing to note about that sed expression though - using \+ is a GNU
extension - do we care about that?  The portable way is to use \{1,\}
but that'd clutter it some more.

-- 
Russell King