I have an application running in a git repository on a branch (say dev). The application modifies the content in some the repository and commits them. I now have to merge these changes into another branch (say master) but the snag is that I don't want to git checkout master before doing this. Is there some way to say "merge current branch into master"?
The "master" in your case appears to be "fast-forwardable". You could "push" the branch to master.
cd /path_to_dir_with_no_branch_switch/
git push . appbranch:master