# OldCheckSum

The checksum of the old configuration file. If you want to update or delete a shared file on a Controller, the checksum of the older version of the file must match the current version of the file, otherwise the action does not run, because the file must have changed.

NOTE: You can use the GetSharedFile action to retrieve the checksum.

Actions: | UpdateSharedFile, UpdateServiceConfig
Type: | String
Default: | None
Required: | Required for `UpdateServiceConfig`. Optional for `UpdateSharedFile`, unless you set `Operation` to `update` or `delete`, in which case it is required.
Example: | `OldCheckSum=ad215bc3e76e021f7cf4c9284e57bf8d`
See Also: |

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