generate series of strings

generate series of strings

[tartifola]

Hi,
is there a way to obtain from the command line a series of strings like

(1:3) (4:6) (7:9)...

always with the same increment. I'm playing with 'seq' and 'sed' but
perhaps it's not the best approach. 
Thanks,
A. 

Re: generate series of strings

[Guillaume Brunerie]

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2010/7/9 <tartifola@gmail.com>

>
>
> Hi,
> is there a way to obtain from the command line a series of strings like
>
> (1:3) (4:6) (7:9)...
>
> always with the same increment. I'm playing with 'seq' and 'sed' but
> perhaps it's not the best approach.
> Thanks,
> A.
>

Hi,
You can use a for-loop :

for (( i = 0; i < 5; i++ ))
do
    echo -n "($(( 3 * i + 1 )):$(( 3 * i + 3))) "
done

Re: generate series of strings

[tartifola]

On Fri, 9 Jul 2010 15:36:00 +0200
Guillaume Brunerie <guillaume.brunerie@gmail.com> wrote:

> 2010/7/9 <tartifola@gmail.com>
> 
> >
> >
> > Hi,
> > is there a way to obtain from the command line a series of strings like
> >
> > (1:3) (4:6) (7:9)...
> >
> > always with the same increment. I'm playing with 'seq' and 'sed' but
> > perhaps it's not the best approach.
> > Thanks,
> > A.
> >
> 
> Hi,
> You can use a for-loop :
> 
> for (( i = 0; i < 5; i++ ))
> do
>     echo -n "($(( 3 * i + 1 )):$(( 3 * i + 3))) "
> done

Thanks for your help, it works perfectly. Just a curiosity, any possible solution without a
loop for? 

Re: generate series of strings

[Joke de Buhr]

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On Friday 09 July 2010 15:42:46 tartifola@gmail.com wrote:
> On Fri, 9 Jul 2010 15:36:00 +0200
> 
> Guillaume Brunerie <guillaume.brunerie@gmail.com> wrote:
> > 2010/7/9 <tartifola@gmail.com>
> > 
> > > Hi,
> > > is there a way to obtain from the command line a series of strings like
> > > 
> > > (1:3) (4:6) (7:9)...
> > > 
> > > always with the same increment. I'm playing with 'seq' and 'sed' but
> > > perhaps it's not the best approach.
> > > Thanks,
> > > A.
> > 
> > Hi,
> > You can use a for-loop :
> > 
> > for (( i = 0; i < 5; i++ ))
> > do
> > 
> >     echo -n "($(( 3 * i + 1 )):$(( 3 * i + 3))) "
> > 
> > done
> 
> Thanks for your help, it works perfectly. Just a curiosity, any possible
> solution without a loop for?

Actually there is a solution without loops. But it not as nice as a looping 
solution (for, while, until, ...). You can use recursive functions as a loop-
replacement. But it's not as easy as a for-loop.


## recursive function
expand() {
    (( $1 < 0 )) && return

    print -n "$(expand $(($1 - 1))) ($((3 * $1 + 1)):$((3 * $1 + 3)))" 
}

## call recursive function
expand 20

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Re: generate series of strings

[Jérémie Roquet]

Hi,

2010/7/9  <tartifola@gmail.com>:
> Just a curiosity, any possible solution without a loop for?

Sure:
 paste <() <(seq 1 3 7) <(seq 3 3 9) <() -d '(:)' | tr '\n' ' '

Best regards,

-- 
Jérémie

Re: generate series of strings

[Bart Schaefer]

2010/7/9 Jérémie Roquet <arkanosis@gmail.com>:
> Hi,
>
>  paste <() <(seq 1 3 7) <(seq 3 3 9) <() -d '(:)' | tr '\n' ' '

Hmm, for me that just chokes with

paste: -d: No such file or directory

I had to move the -d option to before the first <().

Re: generate series of strings

[Jérémie Roquet]

2010/7/10 Bart Schaefer <schaefer@brasslantern.com>:
> 2010/7/9 Jérémie Roquet <arkanosis@gmail.com>:
>>  paste <() <(seq 1 3 7) <(seq 3 3 9) <() -d '(:)' | tr '\n' ' '
> Hmm, for me that just chokes with
> paste: -d: No such file or directory
> I had to move the -d option to before the first <().

Maybe the paste version... I'm using GNU coreutils 7.4

But anyway, the man says "paste [OPTION]... [FILE]...", so it's better
to put -d first ;-)

-- 
Jérémie