Q:

how can I List files in order

I had an 18GB file I needed to download on a less than great Internet connection. Torrenting  wasn't an option. So I busted up the file into 100 segments, and eventually, all of it downloaded. Now I need to put the files back together, using a program which is like cat. 
So I need to list the files, in counting order, and concatenate them.
The FileNames go something like SomeFile1.dcd, SomeFile2.dcd, SomeFile3.dcd SomeFile10.dcd,  ... SomeFile100.dcd 
for the concatenation to work properly, I need to list the files in normal numerical order, otherwise the frames will be all screwy.
how can I list the files in normal numerical  1,2,3,4.... type order?

A:

Using bash brace expansion :
cat SomeFile{1..100}.dcd >final_file

You can have a check at first to see which files it is being expanded to by :
echo SomeFile{1..100}.dcd

Here {1..100} will be expanded to 1,2,3....100.
Example :
$ echo SomeFile{1..5}.dcd
SomeFile1.dcd SomeFile2.dcd SomeFile3.dcd SomeFile4.dcd SomeFile5.dcd

