A command-line utility for accessing the file versioning system of Mac OS. Written in Objective-C. Requires Mac OS 10.12 (Sierra) or higher.

The Versions feature was added in Lion, along with auto-saving, as part of a broad overhaul of the operating system's document model. It's similar to Time Machine in that it saves previous versions of files, but it works separately from it (and without it). This utility provides a way to view, restore, and delete old versions from the command line.

Binary versions are available on the Releases page.

Binaries are self-signed but not notarized, so Mac OS 10.15 (Catalina) and higher display an error upon launching it. Right-click the application icon and select "Open" to enable the option to bypass this security warning.

Usage: versions [option] source_file [destination_file]

If called with no option, lists all versions of the source file with identifiers.

The second argument for the destination file is only needed when using the --restore option.

You can use either the short flag or the long option version of each option (whichever you prefer). Only one option is accepted for a single command; any additional options are ignored.

The current version of the file always has the identifier 0 and cannot be used as an value for any of the options.

To look at all the previous versions of an example file "columns.js":

$ versions columns.js
[  2] Apr 7, 2020 at 10:29:48 PM     columns.js
[  1] Apr 7, 2020 at 10:35:22 PM     columns.js
[  0] Apr 7, 2020 at 10:49:09 PM     columns.js

The program prints a table of previous versions. For each version, it shows an identifier number, the date and time the version was saved, and the file name (which may have changed if the file was renamed). Identifier numbers count down, so 0 is always the most recent (current) version and larger numbers are older.

To view a previous version, use the --view option:

$ versions --view 1 columns.js

This prints the contents of the file to the stdout stream, which you can view directly from the Terminal or combine with other Unix utilities. For example, you can pipe it into less for a scrollable view:

$ versions --view 1 columns.js | less

Or open it as a temporary file in your default text editor:

$ versions --view 1 columns.js | open -ft

Or copy its contents to the clipboard:

$ versions --view 1 columns.js | pbcopy

Or combine it with diff to show the differences with the current version of the file:

$ versions --view 1 columns.js | diff columns.js -

If we want to restore a previous version, we can use the --restore option to save it to a new file name:

$ versions --restore 1 columns.js columns-old.js
Successfully restored version 1 of columns.js to columns-old.js.

The provided number corresponds to the version we want to restore. If no number is provided, an error message is displayed. Restoring a file with this option doesn't change the version history of the original file. If there's already a file with the destination name, it will be overwritten.

We can also restore a previous version by replacing the latest version of the file (instead of saving it to another file). To do this, we use the --replace option:

$ versions --replace 1 columns.js
Successfully restored version 1 of columns.js.

Because we're replacing the original file, we don't need to provide a second file name. We do need to provide a version number or an error is displayed. Restoring a file with this option adds a new version to the history of the file but doesn't remove any of the previous versions.

Deleting versions works the same way. To delete a specific version, use the --delete option:

$ versions --delete 1 columns.js
Successfully deleted version 1 of columns.js.

Note that deleting a version causes the other versions to be renumbered, so be careful issuing another command after a delete.

To delete all versions, use the --deleteAll option:

$ versions --deleteAll columns.js
Successfully deleted all previous versions of columns.js.

Because we're deleting all previous versions, we don't need to provide an identifier. The current version of the file will not be affected by this command. Make sure you really want to delete the file history since this command is irreversible.

Uses GBCli library by Tomaz Kragelj for parsing command-line arguments.

Uses replay icon by Freepik.

• J.C. Fields jcfields@jcfields.dev

• GNU General Public License, version 3

• Restore—A GUI application that does the same thing.