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UPDATED according to changed task.

File file1 with your data created:

$ cat file1
1    10  11
10   200 201
2    20   21
22   2000 2001

Now we sort the file lines and write results to file2:

$ cat file1|sort -n > file2

Or we can even simplify it:

sort -n file1 > file2

Checking the results in file2:

$ cat file2
1    10  11
2    20   21
10   200 201
22   2000 2001