When working with Git, developers often find themselves in situations where they need to switch branches to work on something else but are not ready to make a commit. One useful feature for handling such situations is git stash. This command temporarily shelves (or stashes) changes you've made to your working directory so you can work on something else, and come back and re-apply them later on.

Understanding git stash apply

The git stash apply command is used to reapply changes that were previously stashed. By default, git stash apply re-applies the changes stashed most recently. However, you can specify which stash to apply if you have multiple stashes.

Syntax:

git stash apply
git stash apply stash@{<stash_number>}

Examples of git stash apply

Here are some practical examples:

1. Basic Application of Stash:
   • When changes in your working directory are stashed, they are moved to a stack. To apply the most recently stashed changes, use:

     git stash apply

This will reapply the changes recorded in the latest stash.

1. Applying a Specific Stash:
   • If you have multiple entries in your stash stack, you can apply a specific one by referencing its identifier:

     git stash apply stash@{2}

Here, stash@{2} refers to the third most recent stash because the stash list is zero-indexed.

How git stash apply Works

When you run git stash apply, Git tries to apply the stashed changes to your current working tree. The command only affects the working directory and the index. It does not create any commits. If there are conflicts, Git will not automatically add the changed files to the index. You'll have to resolve these conflicts manually.

Conflicts and Their Resolution

If applying a stash leads to conflicts, Git will mark the files as conflicted, much as it does during a merge. You need to resolve these conflicts by editing the files, and then manually stage them using git add:

git add <file>

Once conflicts are resolved and changes are added, you can continue with your work or commit the changes as needed.

git stash apply vs. git stash pop

It's important to differentiate between git stash apply and git stash pop. Both commands apply changes from a stash, but git stash pop additionally removes the applied stash from the stash list. If you're sure you will not need the stashed changes again, you can use git stash pop to keep your stash list clean.

Summary Table

Here's a summary of the key points regarding git stash apply:

Additional Considerations

• Compatibility with Branches: You can apply a stash to a different branch than the one it was created on. This is useful for applying hotfixes or features developed in different contexts.
• Stash Index: By using the --index option with git stash apply, you can also try to apply the changes that have been staged when the stash was created. This helps in keeping precisely the same state as when it was stashed, including staged and unstaged changes:

   git stash apply --index

• Automation in Scripts: Since git stash apply might lead to conflicts, when scripting, it is prudent to handle potential conflicts programmatically, or ensure stashes apply cleanly before using them in automated scripts.

Conclusion

Using git stash apply effectively allows developers to manage their code changes more flexibly. Whether you're interrupted by an urgent bug fix or need to check something on another branch, stashing provides a safe and quick way to clear your working directory without losing your progress. Understanding how to manage stashes and reapply them can significantly streamline your development workflow.