mc diff

Syntax

The mc diff mc computes the differences between two filesystem directories or MinIO buckets. mc diff lists only those objects which are missing or which differ in size. mc diff does not compare the contents of objects.

The following command computes the difference between an object on a local filesystem and an object in the mydata bucket on the myminio MinIO deployment:

mc diff ~/mydata/myobject.txt myminio/mydata/myobject.txt

The mc diff command has the following syntax:

mc [GLOBALFLAGS] diff SOURCE TARGET
  • Brackets [] indicate optional parameters.

  • Parameters sharing a line are mutually dependent.

  • Parameters seperated using the pipe | operator are mutually exclusive.

Copy the example to a text editor and modify as-needed before running the command in the terminal/shell.

Parameters

SOURCE

Required The object to compare to the TARGET.

For an object from MinIO, specify the alias and the full path to that object (e.g. bucket and path to object). For example:

mc diff play/mybucket/object.txt ~/mydata/object.txt

For an object from a local filesystem, specify the full path to that object. For example:

mc diff ~/mydata/object.txt play/mybucket/object.txt
TARGET

Required The object to compare to the SOURCE.

For an object from MinIO, specify the alias and the full path to that object (e.g. bucket and path to object). For example:

mc diff play/mybucket/object.txt ~/mydata/object.txt

For an object from a local filesystem, specify the full path to that object. For example:

mc diff ~/mydata/object.txt play/mybucket/object.txt

Global Flags

--debug
Optional

Enables verbose output to the console.

For example:

mc --debug COMMAND
--config-dir
Optional

The path to a JSON formatted configuration file that mc uses for storing data. See Configuration File for more information on how mc uses the configuration file.

--JSON
Optional

Enables JSON lines formatted output to the console.

For example:

mc --JSON COMMAND
--no-color
Optional

Disables the built-in color theme for console output. Useful for dumb terminals.

--quiet
Optional

Suppresses console output.

--insecure
Optional

Disables TLS/SSL certificate verification. Allows TLS connectivity to servers with invalid certificates. Exercise caution when using this option against untrusted S3 hosts.

--version
Optional

Displays the current version of mc.

--help
Optional

Displays a summary of command usage on the terminal.

Examples

The following example assumes that the play alias exists in the mc configuration file. You can replace play with the alias for your preferred S3-compatible deployment.

See mc alias for more information on aliases.

mc diff play/bucket1 play/bucket2

Behavior

Output Legend

mc diff uses the following legend when formatting the diff output:

FIRST < SECOND - object exists only in FIRST
FIRST > SECOND - object exists only in SECOND
FIRST ! SECOND - Newer object exists in FIRST

S3 Compatibility

The mc commandline tool is built for compatibility with the AWS S3 API and is tested MinIO and AWS S3 for expected functionality and behavior.

MinIO provides no guarantees for other S3-compatible services, as their S3 API implementation is unknown and therefore unsupported. While mc commands may work as documented, any such usage is at your own risk.