The following command retrieves version information for an object in a bucket named my-bucket:

aws s3api list-object-versions --bucket my-bucket --prefix index.html

Output:

{
    "DeleteMarkers": [
        {
            "Owner": {
                "DisplayName": "my-username",
                "ID": "7009a8971cd660687538875e7c86c5b672fe116bd438f46db45460ddcd036c32"
            },
            "IsLatest": true,
            "VersionId": "B2VsEK5saUNNHKcOAJj7hIE86RozToyq",
            "Key": "index.html",
            "LastModified": "2015-11-10T00:57:03.000Z"
        },
        {
            "Owner": {
                "DisplayName": "my-username",
                "ID": "7009a8971cd660687538875e7c86c5b672fe116bd438f46db45460ddcd036c32"
            },
            "IsLatest": false,
            "VersionId": ".FLQEZscLIcfxSq.jsFJ.szUkmng2Yw6",
            "Key": "index.html",
            "LastModified": "2015-11-09T23:32:20.000Z"
        }
    ],
    "Versions": [
        {
            "LastModified": "2015-11-10T00:20:11.000Z",
            "VersionId": "Rb_l2T8UHDkFEwCgJjhlgPOZC0qJ.vpD",
            "ETag": "\"0622528de826c0df5db1258a23b80be5\"",
            "StorageClass": "STANDARD",
            "Key": "index.html",
            "Owner": {
                "DisplayName": "my-username",
                "ID": "7009a8971cd660687538875e7c86c5b672fe116bd438f46db45460ddcd036c32"
            },
            "IsLatest": false,
            "Size": 38
        },
        {
            "LastModified": "2015-11-09T23:26:41.000Z",
            "VersionId": "rasWWGpgk9E4s0LyTJgusGeRQKLVIAFf",
            "ETag": "\"06225825b8028de826c0df5db1a23be5\"",
            "StorageClass": "STANDARD",
            "Key": "index.html",
            "Owner": {
                "DisplayName": "my-username",
                "ID": "7009a8971cd660687538875e7c86c5b672fe116bd438f46db45460ddcd036c32"
            },
            "IsLatest": false,
            "Size": 38
        },
        {
            "LastModified": "2015-11-09T22:50:50.000Z",
            "VersionId": "null",
            "ETag": "\"d1f45267a863c8392e07d24dd592f1b9\"",
            "StorageClass": "STANDARD",
            "Key": "index.html",
            "Owner": {
                "DisplayName": "my-username",
                "ID": "7009a8971cd660687538875e7c86c5b672fe116bd438f46db45460ddcd036c32"
            },
            "IsLatest": false,
            "Size": 533823
        }
    ]
}