On Sun, Apr 13, 2008 at 09:21:51AM -0500, Mumia W.. wrote: > On 04/13/2008 07:00 AM, Alex Samad wrote: >> Yes I did (thanks twice), but my question which arose from this was why >> this did not work >> >> perl -nle 'next if ( /^\s*;/); print' sip.conf >> >> why do I need the length statement[?] >> >> perl -nle 'next if ( /^\s*;/); print if length $_ > 0' sip.conf >> >> [...] > > First, this might be easier to understand: > > perl -nle 'print unless /^\s*(#|$)/' sources.list > (Replace "#" with ";".) > > Secondly, the "length" statement was needed for your earlier code > because /^\s*;/ won't match blank lines.
I did not want to remove the blank lines of the file, I had presumed
their were not any blank lines in there. upon closer inspection there
are
So this now all makes sense
any now I feel a bit silly
Thanks everyone
>
> Take this code:
> perl -nle 'next if ( /^\s*#/); print if length $_ > 0' sources.list
>
> Simplify it a bit and use more regex's:
> perl -nle 'next if (/^\s*#/ or /^\s*$/); print' sources.list
>
> Integrate the regex'es into a single one:
> perl -nle 'next if /^\s*(#|$)/; print' sources.list
>
> Eliminate "next":
> perl -nle 'print unless /^\s*(#|$)/' sources.list
>
>
> HTH
>
>
>
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09/24/2006
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