UNIX for Dummies Questions & Answers

Hi
I am newbie to unix scripting, but i have enough knowledge to understand.
I have a specific questions like, I use to collect like 3500 files per experiment, each one named like
data_001.img..
data_002.img
data_003.img
....
data_3500.img

I would like to move every 12 files in the 3500 files like, data_001 to data_012.img to a separate directory and data_013.img to data_024.img...and so on. to another directories. I am wondering how to do that by scripting, without doing it manually.
I tried lmoving files using this command, but it does not work

cp data_*([001-012])*

Could you please someone provide me way to do this? thanks in advance.

Please show a detailed example which includes the name structure of the subdirectories and makes the rules totally clear.

Does every file between 001 and 3500 exist?

Hi
I have a folder named study1 under /home/pat/data/study1, which contains all 3500 files with .img extension, and numerically arranged from 001 to 3500. My interest is to move 12 files (from data_ 001 to 012.img) to previous folder (/home/pat/set1) with some name like set1
and next data_013 to 024.img to set2 like this.
thsi is what i mean
Thanks
Pat

Checks existance of files and only tries to move files that exist. Will only create set directory if 1 or more filse exists for range of the 12 value range:

Code:

#/bin/ksh
cd /home/pat/data/study1
num=0
while [ $num -le 3500 ]
do
    FILE=$(printf "data_%03d.img" $num)
    [ -f $FILE ] && MVLIST="$MVLIST $FILE"
    if [ $(($num % 12)) -eq 0 ] || [ $num -eq 3500 ]
    then
        if [ -n "$MVLIST" ]
        then
            [ -d $dir ] || mkdir $dir
            mv $MVLIST $dir
        fi
        MVLIST=
        dir=/home/pat/data/set$((1+num/12))
    fi
    let num+=1
done