mc diff

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

Syntax

Example

The following command computes the difference between the contents in the mydata folder on a local filesystem and the contents in the mydata bucket on the myaistor AIStor deployment:

mc diff ~/mydata/ myaistor/mydata/

Syntax

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 separated 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 S3 bucket or filesystem folder to compare to the TARGET.

For a bucket on AIStor, specify the alias and the bucket. For example:

mc diff myaistor/mybucket/ ~/path/to/mydata/

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

mc diff ~/path/to/mydata/ myaistor/mybucket/

TARGET

Required The filesystem folder or S3 bucket to compare to the SOURCE.

For a bucket from AIStor, specify the alias and the bucket. For example:

mc diff myaistor/mybucket/ ~/path/to/mydata/

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

mc diff ~/path/to/mydata/ myaistor/mybucket/

Global flags

This command supports any of the global flags.

Examples

The following example assumes that the myaistor alias exists. Replace myaistor with the alias for your preferred S3-compatible deployment.

mc diff myaistor/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 with AIStor 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.