How to split file with a trick in bash -

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i have 2 question in split command:

1) how can split huge file in format?

x0 x1 . . . x10 . . .

2) how can split huge file in format?

0 1 . . . 10 . . . 100 . . .

what tried not satisfactory because result is:

x00 x01 x02 . . . x10 . . . x100 . . .

thank you

first question: 

>> ls file >> split -a 1 -d file >> ls file x0 x1 x2 x3 ...

however, get

split: output file suffixes exhausted

with method if there more 9 split files. can use

>> split -d file >> ls file x00 x01 x02 ...

and use rename:

>> rename 's/^x0/x/' x0* >> ls file x0 x1 x2 ...

second question: use 

split -a 1 -d file ''

if have less 10 split files. otherwise, use 

split -d file ''

and 

rename 's/^0//' 0*

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