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```
SYNOPSIS:
duplicacy diff - Compare two snapshots or two revisions of a file
USAGE:
duplicacy diff [command options] [<file>]
OPTIONS:
-id <snapshot id> diff with the snapshot with the specified id
-r <revision> [+] the revision number of the snapshot
-hash compute the hashes of on-disk files
-storage <storage name> retrieve files from the specified storage
```
The *diff* command compares the same file in two different snapshots if a file is given, otherwise compares the two snapshots.
The file must be specified with a path relative to the repository.
You can specify a different snapshot id rather than the default snapshot id.
If only one revision is given by `-r`, the right hand side of the comparison will be the on-disk file. The `-hash` option can then instruct this command to compute the hash of the file.
You can use the `-storage` option to select a different storage other than the default one.