split_for_sort: Split a given file into buckets

The target bucket is decided based on the first X characters of a line.
The bucket name gets a prefix defined as argument and can be sorted
faster on weak hardware. Note: This is just a split alternative.

Real world usage in a shell script with a file in which the first 10
characters are the equal in each line, the following 2 bytes are
evaluated for splitting:

split_for_sort TMPSFS 12 raw_data.txt
for f in TMPSFS ; do
    sort -o "${f}_sorted" -u "${f}"
done
\# Rely on the argument resolution to go with lexical order
cat TMPSFS*_sorted > sorted_data.txt
rm TMPSFS*

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