I've forgotten again how to do this --> 0-100

I've forgotten again how to do this --> 0-100

[Timothy J Luoma]

I know this is dumb, and I know I've asked before, and I know I should be  
able to figure it out.

Ignorance, expressed, I'll still ask:

if I want to make a loop to go from 0 to 100, how do I do that?

for i in 0-100; do
	echo $i
done

but the "0-100" part is the part I can never remember....


		TjL, Class Dunderhead

ps -- what is this actually called, so I can possibly find it in the man pages ?

		

Re: I've forgotten again how to do this --> 0-100

[Danek Duvall]

> if I want to make a loop to go from 0 to 100, how do I do that?
> 
> for i in 0-100; do
> 	echo $i
> done

for i in {0..100}; do
    echo $i
done

> ps -- what is this actually called, so I can possibly find it in the man pages ?

brace expansion, I believe.

Danek

Re: I've forgotten again how to do this --> 0-100

[Mirar]

> > ps -- what is this actually called, so I can possibly find it in the man pages ?
> 
> brace expansion, I believe.

What it really does is expading "{0..100}" to "0 1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79
80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100", so 

for i in {0..100};  ...

is the same as 

for i in 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46
47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69
70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92
93 94 95 96 97 98 99 100;  ...

/Mirar

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Re: I've forgotten again how to do this --> 0-100

[Andrew Main]

Timothy J Luoma wrote:
>for i in 0-100; do
>	echo $i
>done

for ((i=0;i<=100;i++)); do
	echo $i
done

takes less memory than the brace expansion method.

-zefram

Re: I've forgotten again how to do this --> 0-100

[Geoff Wing]

Andrew Main <zefram@tao.co.uk> typed:
:Timothy J Luoma wrote:
:>for i in 0-100; do
:>	echo $i
:>done
:for ((i=0;i<=100;i++)); do
:	echo $i
:done
:takes less memory than the brace expansion method.

And is only available in zsh-3.1.2 up.  Or maybe 3.1.1 up (but it's not one
of the 30 odd zsh versions I've got in my bin dir).
-- 
Geoff Wing [gcw@pobox.com]                         Phone    : +61-3-9818 2977
 Technical Manager: PrimeNet Computer Consultants  Facsimile: +61-3-9818 5155
 Work URL: http://www.primenet.com.au/             Mobile   : 0412 162 441
 Ego  URL: http://pobox.com/~gcw/

Re: I've forgotten again how to do this --> 0-100

[Brandon C. George]

On Thu, Jan 15, 1998 at 10:28:37AM +0000, Andrew Main wrote:
> Timothy J Luoma wrote:
> >for i in 0-100; do
> >	echo $i
> >done
> 
> for ((i=0;i<=100;i++)); do
> 	echo $i
> done
> 
> takes less memory than the brace expansion method.
> 
> -zefram

Is there a switch I need to do something like this?

> atc1:~> for ((i=0;i<=100;i++)); do
> zsh: parse error near `((i=0'

-brandon

Re: I've forgotten again how to do this --> 0-100

[Andrew Main]

Brandon C. George wrote:
>Is there a switch I need to do something like this?

You need zsh-3.1.something.  On earlier versions you can still do

integer i=0
while ((i<=100)); do
	echo $i
	((i++))
done

-zefram

Re: I've forgotten again how to do this --> 0-100

[Sweth Chandramouli]

On Thu, Jan 15, 1998 at 10:28:37AM +0000, Andrew Main wrote:
> Timothy J Luoma wrote:
> >for i in 0-100; do
> >	echo $i
> >done
> 
> for ((i=0;i<=100;i++)); do
> 	echo $i
> done
> 
> takes less memory than the brace expansion method.

how does it compare (memory-wise) to the following:

while (( $i < 101 )); do
   echo $i
   i=$((i+1))
done

(the brace expansion method makes the most sense to me, intuitively, followed by 
the version i used above; the syntax of your for statement, however, always 
confuses me.)

	
-- 
"Countin' on a remedy I've counted on before
Goin' with a cure that's never failed me
What you call the disease
I call the remedy"  -- The Mighty Mighty Bosstones

Re: I've forgotten again how to do this --> 0-100

[Geoff Wing]

Sweth Chandramouli <sweth@astaroth.nit.gwu.edu> typed:
:On Thu, Jan 15, 1998 at 10:28:37AM +0000, Andrew Main wrote:
:> Timothy J Luoma wrote:
:> >for i in 0-100; do
:> >	echo $i
:> >done
:> for ((i=0;i<=100;i++)); do
:> 	echo $i
:> done
:> takes less memory than the brace expansion method.
:how does it compare (memory-wise) to the following:
:while (( $i < 101 )); do
:   echo $i
:   i=$((i+1))

let i++

:done
-- 
Geoff Wing [gcw@pobox.com]                         Phone    : +61-3-9818 2977
 Technical Manager: PrimeNet Computer Consultants  Facsimile: +61-3-9818 5155
 Work URL: http://www.primenet.com.au/             Mobile   : 0412 162 441
 Ego  URL: http://pobox.com/~gcw/

Re: loops and all that

[Sven Guckes]

FYI:
I have added the tips on "iterative loops"
(brace expansion etc) to my page about
	"ZShell Tips":
	http://www.math.fu-berlin.de/~guckes/zsh/tips.html

If you have more stuff - send it!

Sven

-- 
Sven Guckes guckes@math.fu-berlin.de using zsh-3.0.5 [released 961218]
ZSH  http://www.math.fu-berlin.de/~guckes/zsh/  Tips and tricks
ZSH  http://www.peak.org/zsh/                   Z shell home page  [971022]

related question

[Sweth Chandramouli]

On Thu, Jan 15, 1998 at 10:28:37AM +0000, Andrew Main wrote:

> for ((i=0;i<=100;i++)); do
> 	echo $i
> done

	i've got a similar loop (just converted to this new for format, which 
i'm trying to get used to using), to set the values in an array:

while read line ; do	
   for ((i=1;i<=11;i++)) ; do 
      field[$i]=`echo $line | cut -d';' -f$i | tr -d '"'`
   done
done < in.file

	this should take a line of the format 

"foo1";"foo2";"foo3"; [...] ;"foo11"

	and stuff each foo# into the appropriate spot in the array named field.  
my question is, how do i then concatenate all of these values back into one 
line?  what i'm currently doing, since the max value for i is so small, is just 
	
echo 
"\"$field[1]\";\"$field[2]\";\"$field[3]\";\"$field[4]\";\"$field[5]\";\"$field[
6]\";\"$field[7]\";\"$field[8]\";\"$field[9]\";\"$field[10]\";\"$field[11]\""

pretty soon, however, i'm going to have to use this script on a larger set of 
data, with a lot more fields per line; i don't want to have to type out each 
item of the array individually.  i know there's an easier way to do it, but it's 
late, and my brain isn't working very well.

	any suggestions (other than using perl, which is what all of my 
coworkers say to do)?
	
	tia,
	sweth.


-- 
"Countin' on a remedy I've counted on before
Goin' with a cure that's never failed me
What you call the disease
I call the remedy"  -- The Mighty Mighty Bosstones

Re: related question

[Bernd Eggink]

Sweth Chandramouli wrote:
> 
> while read line ; do
>    for ((i=1;i<=11;i++)) ; do
>       field[$i]=`echo $line | cut -d';' -f$i | tr -d '"'`
>    done
> done < in.file
> 
>         this should take a line of the format
> 
> "foo1";"foo2";"foo3"; [...] ;"foo11"
> 
>         and stuff each foo# into the appropriate spot in the array named field.

You don't need cut and tr, zsh can do all that:

   while read line
   do field=(${(s(;))line})  # split at ;
      field=${field#?}       # remove leading quotes
      field=${field%?}       # remove trailing quotes
   done

> my question is, how do i then concatenate all of these values back into one
> line?  what i'm currently doing, since the max value for i is so small, is just
> 
> echo
> "\"$field[1]\";\"$field[2]\";\"$field[3]\";\"$field[4]\";\"$field[5]\";\"$field[
> 6]\";\"$field[7]\";\"$field[8]\";\"$field[9]\";\"$field[10]\";\"$field[11]\""
> 
> pretty soon, however, i'm going to have to use this script on a larger set of
> data, with a lot more fields per line; i don't want to have to type out each
> item of the array individually.  i know there's an easier way to do it, but it's
> late, and my brain isn't working very well.
> 
>         any suggestions (other than using perl, which is what all of my
> coworkers say to do)?

   for ((i=1; i<=$#field; ++i))
   do 
      field[i]="\"$field[i]\""   # restore quotes
   done

   line=${(j(;))field}   # join elements using ;

Hope that helps!

-- 
Bernd Eggink
Regionales Rechenzentrum der Universitaet Hamburg
eggink@rrz.uni-hamburg.de
http://www.rrz.uni-hamburg.de/eggink/BEggink.html

Re: related question

[Mirar]

> my question is, how do i then concatenate all of these values back into one 
> line?  what i'm currently doing, since the max value for i is so small, is just 

print -n \"$field[17]\"

/Mirar
__________________________________________________________________________
Idonex AB               Telefon      Telefax      nalle
Skolgatan 10		013-376814   013-376801   0708-376867
582 35 Linköping        mirar@idonex.se           http://www.idonex.se/