Re: non-convergent file edit?

[Mark . Burgess]

ReplaceOnce cannot be implemented, since you don't know what you did last
time, next time if you get my drift.

M

On 16 Mar, rader@ginseng.hep.wisc.edu wrote:
> 
>  > > Assume...
>  > > 
>  > >  echo "01Jan70" > f
>  > > 
>  > > then is there a way to do
>  > > 
>  > >  mv f f.OLD && \
>  > >  cat f.OLD | perl -ne "s/\d\d\w\w\w\d\d/`date +%d%h%y`/; print" > f && \
>  > >  rm f.OLD
>  > > 
>  > > with editfiles??
>  > > 
>  > > Just curious.  Using shellcommands is a reasonable solution. 
> 
>  > From: Chris Edillon
>  >   you could do something like this:
>  > 
>  >     any::
>  >         { /tmp/f
>  >           ReplaceAll "[[:digit:]]{2}[[:alpha:]]{3}[[:digit:]]{2}" With
>  > "$(day)$(month)$(year)"
>  >         }
>  > 
>  > but cfagent will complain that it is non-convergent since the string
>  > you'd put in place will always match the regex so it will get re-edited
>  > every run.  if you know that all of the date strings in question are
>  > of a certain year or have some other static characteristic you could
>  > put in the regex, it might work.  
> 
> Yeah, I played around with that.  The replacement string is the
> same length as the regex and matches the regex, so the substitution
> non-convergent... like saying in perl terms...
> 
>  $a = "A 01Jan70 B 01Jan70 C"; 
>  $b = "16Mar04";
>  while ( $a =~ /\d\d\w\w\w\d\d/ ) {
>    $a =~ s/\d\d\w\w\w\d\d/$b/;
>    print "oops!\n";
>  }
> 
> Seems to me (a cfengine novice) that ReplaceAll should behave like
> s/regex/newstr/g (magically converge?) or maybe there should be 
> 
>  ReplaceOnce regex With newstr
> 
> steve 
> - - - 
> systems & network guy
> high energy physics
> university of wisconsin
> 
> 
> 
> _______________________________________________
> Help-cfengine mailing list
> Help-cfengine@gnu.org
> http://mail.gnu.org/mailman/listinfo/help-cfengine



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Work: +47 22453272            Email:  Mark.Burgess@iu.hio.no
Fax : +47 22453205            WWW  :  http://www.iu.hio.no/~mark
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~