I made few local changes in the master in git repository and released I have to create a new branch. I created a new branch and committed the changes using
git checkout -b changes
git add <files>
git commit -m "new feature in branch"
The name of modified file is "run.pl". Before the new branch, git status on master was
On branch master
Changes not staged for commit
modified run.pl
Untracked files
build1.pl
After the new branch, git status in master is
On branch master
Untracked files
build1.pl
I could not understand how git status on master can change when I committed the changes only to a branch
I made few local changes in the master
That's not actually what you did. You made changes to the files in the directory. Until you commit those changes, they're not "on" any branch, they only exist in the working directory.
The "status" in question is the state of the working directory, compared to the branch that you're currently working on, which was master.
It's not that modifying one branch changes the status in another, it's that you've changed the status of your working directory. When you switched branches, the uncommitted changes stayed put. When you committed those changes to the new branch, they were no longer untracked, so Git no longer has any untracked changes to report to you.
来源：https://stackoverflow.com/questions/22796711/git-status-on-master-and-branches