$ git checkout --ours -- file1.txt
# Use our version of file1, delete all their changes
$ git checkout --theirs -- file2.txt
# Use their version of file2, delete all our changes
$ git checkout --ours -- file1.txt
# Use our version of file1, delete all their changes
$ git checkout --theirs -- file2.txt
# Use their version of file2, delete all our changes