1. Identify the commit short hash

   git log --pretty=oneline --abbrev-commit

   abcd1234 Update to Fix for issue B cdababcd Fix issue B deab3412 Fix issue A ....

2. If you want to squash (merge) last two commit

   git rebase -i deab3412

3. This opens up a nano editor for merging. And it looks like below

   .... pick cdababcd Fix issue B pick abcd1234 Update to Fix for issue B ....

4. Rename the word pick to squash which is present before abcd1234. After rename it should be like below.

   .... pick cdababcd Fix issue B squash abcd1234 Update to Fix for issue B ....

5. Now save and close the nano editor. Press ctrl + o and press Enter to save. And then press ctrl + x to exit the editor.

6. Now its squashed successfully, you can verify it by checking logs.

   git log --pretty=oneline --abbrev-commit

   1122abcd Fix issue B deab3412 Fix issue A ....

7. Now push to logs. Note to add + sign before the branch name.

   #git push origin +master

Note : This is based on using git on ubuntu shell. If you are using different os (Windows or Mac) then above commands are same except editor. You might get different editor.