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koobi

11-15-2009 04:05 AM

Echo sequence of numbers with '0' padding for length of 3 chars in CLI

I'm trying to run this command directly via CLI instead of via a shell script.

This is what I have:

Code:

$ wget http://www.example.org/module_{1..190}.so

That would generate something like:

Code:

http://www.example.org/module_1.so

http://www.example.org/module_2.so

.

.

http://www.example.org/module_9.so

http://www.example.org/module_10.so

.

.

http://www.example.org/module_190.so

etc.

But, the problem is, files are named like this:

Code:

module_001.so

module_002.so

.

.

module_009.so

module_010.so

.

.

module_190.so

How would I do that?
Thanks.

pixellany

11-15-2009 04:31 AM

Google foound a lot of stuff on zero-padding.

e.g. try "seq -w"

as in:

Code:

for num in $(seq -w 1 10);do

    echo "number is "$num

done

ghostdog74

11-15-2009 05:22 AM

so why can't you do like this?

Code:

echo {000..190}

H_TeXMeX_H

11-15-2009 05:57 AM

I know this works:

Code:

printf "%03d\n" {1..190}

So:

Code:

printf "http://www.example.org/module_%03d.so\n" {1..190}

koobi

11-15-2009 02:19 PM

I probably should have mentioned that I've also forgotten how to quote the command so that it's not interpreted literally in the one liner.

I did try out seq (but without the -w switch) but how do I quote it into my example?

I also like the clean printf solution but I really don't remember how to quote it in.

This obviously won't work:

Code:

wget printf "http://www.doublefine.com/themes/site_themes/default/images/comics/sc/sc_%03d.jpg" {1..190}

Using wget's -e switch also throws an error.
Unfortunately, I need you to spoon feed me and tell me exactly how I can use it.
I really should re-learn my shell commands.

H_TeXMeX_H

11-15-2009 02:36 PM

well, what I would do is:

Code:

printf "http://www.doublefine.com/themes/site_themes/default/images/comics/sc/sc_%03d.jpg\n" {1..190} > get

wget -i get

it's easier like that. If you don't like that, then you can just do:

Code:

printf "http://www.doublefine.com/themes/site_themes/default/images/comics/sc/sc_%03d.jpg\n" {1..190} | while read line; do wget "$line"; done

koobi

11-15-2009 02:54 PM

I prefer the second solution. Thanks a lot :)

Isn't it possible to do something similar to:

Code:

wget http://example.org/foo{1..5}.bar

I remember doing something similar ages ago...maybe it was in Perl?

Kenhelm

11-15-2009 06:46 PM

curl is better than wget for this because it has a built in ability to create sequences.
From the curl man page:

Code:

You can specify multiple URLs or parts of URLs by writing part sets

within braces as in:



http://site.{one,two,three}.com



or you can get sequences of alphanumeric series by using [] as in:



ftp://ftp.numericals.com/file[1-100].txt

ftp://ftp.numericals.com/file[001-100].txt    (with leading zeros)

ftp://ftp.letters.com/file[a-z].txt



No nesting of the sequences is supported at the moment, but you can

use several ones next to each other:



http://any.org/archive[1996-1999]/vol[1-4]/part{a,b,c}.html

H_TeXMeX_H

11-16-2009 04:14 AM

Quote:

Originally Posted by Kenhelm (Post 3758274)

curl is better than wget for this because it has a built in ability to create sequences.
From the curl man page:

Code:

You can specify multiple URLs or parts of URLs by writing part sets

within braces as in:



http://site.{one,two,three}.com



or you can get sequences of alphanumeric series by using [] as in:



ftp://ftp.numericals.com/file[1-100].txt

ftp://ftp.numericals.com/file[001-100].txt    (with leading zeros)

ftp://ftp.letters.com/file[a-z].txt



No nesting of the sequences is supported at the moment, but you can

use several ones next to each other:



http://any.org/archive[1996-1999]/vol[1-4]/part{a,b,c}.html

Indeed, if you wanted to use curl instead of wget you can do:

Code:

curl -o sc_#1.jpg http://www.doublefine.com/themes/site_themes/default/images/comics/sc/sc_[001-190].jpg

bigearsbilly

11-16-2009 04:40 AM

if you use the (IMHO) superior korn shell you can use typeset

observe:

Code:

$ typeset -Z3 a

$ a=1

$ echo $a

001

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