UNIX for Beginners Questions & Answers

Hello Everyone, I need help here . I need to sort a file for one of my requirement , The file has to be sorted using a key with 4 columns. Sorting is working fine on those 4 columns but when the key is matching for many rows the other columns are also getting sorted which is not required .

Giving an example here : File = Input.txt

Code:

1 101 100 
1 001 200
1 002 100

Here I am using below command to sort.

Code:

Sort -k1,1 -k3  Input.txt

This gives me below output:

Code:

1 002  100
1 101 100
1 001 200

I don't want to sort the second column here . I have tried with -s option for stable sort but the same is not supported .

Please help.