Substituting all but a trailing digit/number

Substituting all but a trailing digit/number

[zzapper]

I want to generalise top3 into top4,top5..etc

function top3()
{
# description : vi 3 newest files
file=$0
num=${file//[[:alpha:]]/}
gvim.exe -p $(l\s *(.om[1,$num])) &
}

In the above substitution I get the "number" by stripping out the alphas 
which is kind of a trick

But how could I get filter just the trailing number (in VIM I would use 
memory)

-- 
zzapper
http://www.rayninfo.co.uk/vimtips.html

Re: Substituting all but a trailing digit/number

[Peter Stephenson]

zzapper wrote:
> 
> I want to generalise top3 into top4,top5..etc
> 
> function top3()
> {
> # description : vi 3 newest files
> file=$0
> num=${file//[[:alpha:]]/}
> gvim.exe -p $(l\s *(.om[1,$num])) &
> }
> 
> In the above substitution I get the "number" by stripping out the alphas 
> which is kind of a trick
> 
> But how could I get filter just the trailing number (in VIM I would use 
> memory)

Use

  num=${(M)0%%<->}

The (M) tells the shell to substitute the matched part instead of
removing the matched part.

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070


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Re: Substituting all but a trailing digit/number

[zzapper]

Peter Stephenson <pws@csr.com> wrote in news:200707131248.l6DCmHAI018710
@news01.csr.com:

> zzapper wrote:
>> 
>> I want to generalise top3 into top4,top5..etc
>> 
>> But how could I get filter just the trailing number (in VIM I would use 
>> memory)
> 
> Use
> 
>   num=${(M)0%%<->}
> 
> The (M) tells the shell to substitute the matched part instead of
> removing the matched part.
Thanks Peter,
And If I wanted to anchor the number to the end?



-- 
zzapper
http://www.rayninfo.co.uk/vimtips.html

Re: Substituting all but a trailing digit/number

[Stephane Chazelas]

On Fri, Jul 13, 2007 at 01:22:56PM +0000, zzapper wrote:
> Peter Stephenson <pws@csr.com> wrote in news:200707131248.l6DCmHAI018710
> @news01.csr.com:
> 
> > zzapper wrote:
> >> 
> >> I want to generalise top3 into top4,top5..etc
> >> 
> >> But how could I get filter just the trailing number (in VIM I would use 
> >> memory)
> > 
> > Use
> > 
> >   num=${(M)0%%<->}
> > 
> > The (M) tells the shell to substitute the matched part instead of
> > removing the matched part.
> Thanks Peter,
> And If I wanted to anchor the number to the end?
[...]

%% matches at the end, as much as possible.

You could also do

num=${0##*[!0-9]}

(remoes everything up to the rightmost non-digit).

That even happesns to  be POSIX.

Also, why are you using ls?

Why not simply

gvim -p *(.om[1,$num])

-- 
Stéphane

Re: Substituting all but a trailing digit/number

[zzapper]

> Also, why are you using ls?
> 
> Why not simply
> 
> gvim -p *(.om[1,$num])
> 
THNX Stephane
I can give no rational answer!!

-- 
zzapper
http://www.rayninfo.co.uk/vimtips.html