windows batch file script to sort URLs - windows

Question

How do I write a windows batch script to sort URLs by grouping those with unique file names together in a text file? I don't know how to describe further what I want to achieve but I hope the example below explains everything:
I want this text
http://example.com/5235/Guava.jpg
http://example.com/2725/Guava.jpg
http://example.com/4627/Guava.jpg
http://example.com/8385/Guava.jpg
http://example.com/3886/Lemon.jpg
http://example.com/5896/Lemon.jpg
http://example.com/2788/Lemon.jpg
http://example.com/1758/Lemon.jpg
http://example.com/1788/Apple.jpg
http://example.com/1567/Apple.jpg
http://example.com/8065/Apple.jpg
http://example.com/6467/Apple.jpg
http://example.com/1464/Banana.jpg
http://example.com/6581/Banana.jpg
http://example.com/4642/Banana.jpg
http://example.com/8635/Banana.jpg
http://example.com/2578/Pineapple.jpg
http://example.com/1452/Pineapple.jpg
http://example.com/8652/Pineapple.jpg
http://example.com/9463/Pineapple.jpg
http://example.com/9765/Peach.jpg
http://example.com/3578/Peach.jpg
http://example.com/3583/Peach.jpg
http://example.com/9467/Peach.jpg
http://example.com/3683/Mango.jpg
http://example.com/3479/Mango.jpg
http://example.com/1795/Mango.jpg
http://example.com/7345/Mango.jpg
sorted this way
http://example.com/5235/Guava.jpg
http://example.com/3886/Lemon.jpg
http://example.com/1788/Apple.jpg
http://example.com/1464/Banana.jpg
http://example.com/2578/Pineapple.jpg
http://example.com/9765/Peach.jpg
http://example.com/3683/Mango.jpg
http://example.com/2725/Guava.jpg
http://example.com/5896/Lemon.jpg
http://example.com/1567/Apple.jpg
http://example.com/6581/Banana.jpg
http://example.com/1452/Pineapple.jpg
http://example.com/3578/Peach.jpg
http://example.com/3479/Mango.jpg
http://example.com/4627/Guava.jpg
http://example.com/2788/Lemon.jpg
http://example.com/8065/Apple.jpg
http://example.com/4642/Banana.jpg
http://example.com/8652/Pineapple.jpg
http://example.com/3583/Peach.jpg
http://example.com/1795/Mango.jpg
http://example.com/8385/Guava.jpg
http://example.com/1758/Lemon.jpg
http://example.com/6467/Apple.jpg
http://example.com/8635/Banana.jpg
http://example.com/9463/Pineapple.jpg
http://example.com/9467/Peach.jpg
http://example.com/7345/Mango.jpg
In other words, for this particular example (withe four of each fruit jpeg) I want to sort lines according to this manner: 1, 5, 9, 13, 17, 21, 25, 2, 6, 10, 14, 18, 22, 26, and so on. I hope you get what I mean.
The text file always contains urls with the same number of every "fruit" picture. There can't be six lemon jpg files and four guava jpg files. I hope you get what I what I mean.

Answer 1

Maybe something like this:
#ECHO OFF
SET origfile=urls.txt
SET c=1
SET skip=4
FOR /L %%c IN (1,1,%skip%) DO IF EXIST %origfile%.%%c DEL %origfile%.%%c
FOR /F "tokens=*" %%L IN (%origfile%) DO CALL :process "%%L"
DEL %origfile%
FOR /L %%c IN (1,1,%skip%) DO (
TYPE %origfile%.%%c >> %origfile%
DEL %origfile%.%%c
)
GOTO :EOF
:process
ECHO %~1>>%origfile%.%c%
SET /A c=c%%skip+1
The idea is to output subsequent lines to different files, repeating the sequence every 4 lines (and 4 is parametrised here actually, so you can easily change it), then concatenate those files under the original name.

Answer 2

Run this on your file. Algorithm as described in my comment above.
#!/bin/bash
FILE=$1
FIRST=$(head -1 $FILE)
COUNT=$(grep $FIRST $FILE | wc -l)
LINES=$(uniq $FILE)
for i in $(seq 1 $COUNT); do
echo $LINES | tr " " "\n"
done

Answer 3

You can tell sort where to start comparing:
/+n Specifies the character number, n, to
begin each comparison. /+3 indicates that
each comparison should begin at the 3rd
character in each line. Lines with fewer
than n characters collate before other lines.
By default comparisons start at the first
So if your URI prefix is always the same (which your comments indicated) you can just run the file through
sort /+25 list.txt /O:list_new.txt
which should sort it by file name, then.