How to sort through files that are listed 1-20, like File1, File10, File20, and then I want to do rename them so that they are padded to 4 digits. How would I do that, considering normally files would go File1, then File10?

Ans:

I think this should get the whole thing done.  Well, at least, on bash it works! 

Basical logic is:

get filenames;
strip string from filename;
strip number from filename;
check lengt of number part of filename;
add as much 0es as needed to number part;
rename file;

#!/bin/bash

path="/file/path/";
files="/file/path/*";

for file in $files; do {
name=$(basename $file);
echo $name;
newname=$(echo "$name" | sed "s/[0-9]//g")
oldnum=$(echo "$name" | sed "s/[^0-9]//g")

if [ ${#oldnum} -lt 2 ]; then
{
newnum=000$oldnum;
}
elif [ ${#oldnum} -lt 3 ]; then
{
newnum=00$oldnum;
}
elif [ ${#oldnum} -lt 4 ]; then
{
newnum=0$oldnum;
}
fi
newfile=$newname$newnum;
mv $file $path/$newfile;
}
done;

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