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Add Check If A File Is Under Version Control as a Git TIL

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2025-11-02 11:01:30 -06:00
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README.md
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@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
_1677 TILs and counting..._
_1678 TILs and counting..._
See some of the other learning resources I work on:
@@ -322,6 +322,7 @@ If you've learned something here, support my efforts writing daily TILs by
- [Change The Start Point Of A Branch](git/change-the-start-point-of-a-branch.md)
- [Check How A File Is Being Ignored](git/check-how-a-file-is-being-ignored.md)
- [Check If A File Has Changed In A Script](git/check-if-a-file-has-changed-in-a-script.md)
- [Check If A File Is Under Version Control](git/check-if-a-file-is-under-version-control.md)
- [Checking Commit Ancestry](git/checking-commit-ancestry.md)
- [Checkout Old Version Of A File](git/checkout-old-version-of-a-file.md)
- [Checkout Previous Branch](git/checkout-previous-branch.md)

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git/check-if-a-file-is-under-version-control.md Normal file
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# Check If A File Is Under Version Control
The `git ls-files` command can be used with the `--error-unmatch` flag to check
if a file is under version control. It does this by checking if any of the
listed files appears on the _index_. If any does not, it is treated as an error.
In a project, I have a `README.md` that is under version control. And I have
`node_modules` that shouldn't be under version control (which is why they are
listed in my `.gitignore` file). I can check the README and a file somewhere in
`node_modules`.
```bash
❯ git ls-files --error-unmatch README.md
README.md
❯ git ls-files --error-unmatch node_modules/@ai-sdk/anthropic/CHANGELOG.md
error: pathspec 'node_modules/@ai-sdk/anthropic/CHANGELOG.md' did not match any file(s) known to git
Did you forget to 'git add'?
```
Notice the second command results in an error because of the untracked
`CHANGELOG.md` file in `node_modules`.
Here is another example of this at work while specifying multiple files:
```bash
❯ git ls-files --error-unmatch README.md node_modules/@ai-sdk/anthropic/CHANGELOG.md package.json
README.md
package.json
error: pathspec 'node_modules/@ai-sdk/anthropic/CHANGELOG.md' did not match any file(s) known to git
Did you forget to 'git add'?
```
Each tracked file gets listed and then the untracked file results in an error.
See `man git-ls-files` for more details.