Add file contents to the staging area. Synonym of git add.

# To add a file to the index:
git stage <path/to/file>

# To add all files (tracked and untracked):
git stage -A

# To only add already tracked files:
git stage -u

# To also add ignored files:
git stage -f

# To interactively stage parts of files:
git stage -p

# To interactively stage parts of a given file:
git stage -p <path/to/file>

# To interactively stage a file:
git stage -i