gistfile1.txt

    /tmp ⚡ mkdir foo

    /tmp ⚡ cd foo

    /tmp/foo ⚡ git init
    Initialized empty Git repository in /private/tmp/foo/.git/

    /tmp/foo ⚡ echo "x" > x

    /tmp/foo ⚡ git add x

    /tmp/foo ⚡ git commit -m "add x" x
    [master (root-commit) 583fb7e] add x
    1 files changed, 1 insertions(+), 0 deletions(-)
    create mode 100644 x

    /tmp/foo(master) ⚡ git checkout -b bar
    Switched to a new branch 'bar'

    /tmp/foo(bar) ⚡ ls
    x

    /tmp/foo(bar) ⚡ echo "y" > y

    /tmp/foo(bar) ⚡ git add y

    /tmp/foo(bar) ⚡ git commit -m "add y" y
    [bar 3906d20] add y
    1 files changed, 1 insertions(+), 0 deletions(-)
    create mode 100644 y

    /tmp/foo(bar) ⚡ ls
    x  y

    /tmp/foo(bar) ⚡ git checkout master
    Switched to branch 'master'

    /tmp/foo(master) ⚡ ls
    x

    /tmp/foo(master) ⚡ git branch -a
      bar
    * master

    /tmp/foo(master) ⚡ git checkout bar
    Switched to branch 'bar'

    /tmp/foo(bar) ⚡ echo "x" >> x

    /tmp/foo(bar) ⚡ git co master
    M	x
    Switched to branch 'master'

    /tmp/foo(master) ⚡ cat x
    xx