Shell Programming and Scripting

Hello,
What's the best way to split a large into multiple files based on the last digit in the first column.
input file:
f
2738483300000x0y03772748378831x1y13478378358383x2y23743878383802x3y33787828282820x4y43748838383881x5y5

Desired Output:
f0
3738483300000x0y03787828282820x4y4

f1
3772748378831x14y143748838383881x53y51

f2
3743878383802x28y73

f3
3478378358383x56y66


the file is about 60Million records, and im using grep to do the splitting but i guess there must be a faster way. grep ^3.........."$i" ( where value of i is from 0 to 9 )

Appreciate your ideas .

Alain

Can you explain what logix is used : i.e. Why are there multiple x and y in files f0 and f1
How are the records and fields separated?

Apologies, i pasted a table .
assume the input file is one column as below:
fileIni
------
198760
676549
378763
376830
367389
378383

i need to split the above file in muliple files based on the last digit of each value in that column ( i.e ending with 0 in one file , ending with 1 in another , till 9 - of course maximum possible seggragation is 10 files)

so the above will go into these files:
file0
-----
198760
376830

file2
-------
378763
378383

file3
-------
676549
367389

Thx

Code:

while read L
do
    # use ONE of the lines below
    echo $L >> f${L:5}    # assuming records have length 6
    echo $L >> f${L:$((${#L}-1))} # else
done < fileIni

Better:

Code:

while read L
do
    echo $L >> f${L:(-1)}
done < fileIni

or in 1 line

Code:

while read L; do echo $L >> f${L:(-1)}; done < fileIni

Thank you,
i tried it with a file having 3 columns as i expected the spliting would be based on the last digit of the first column, but i had the splitting based on the last ( 3rd ) column.
can you help please?

Alain

If columns are space-separated

Code:

while read L M
do
    echo "$L $M" >> f${L:(-1)}
done < fileIni

else add

Code:

IFS="<separator>"

at the beginning

Many Thanks!

Would you mind to explain how this partitioning is working :
specifically f${L-1)}


Alain