basics - auto staging?

[Marcin Mikłas <m.miklas@xxxxxxxxxxxx>]

Hello,

when I execute
git commit file.txt
(by listing file as argumentbut without the -a switch) for a file 
file.txt that I have made changes without staged them in the index, the 
changes are still commited.
Is there a way to make this work like command
git commit
without committing the changes that are not staged in the index?

Best
Marcin