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234 lines
13 KiB
Markdown
234 lines
13 KiB
Markdown
---
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title: "rclone sync"
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description: "Make source and dest identical, modifying destination only."
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# autogenerated - DO NOT EDIT, instead edit the source code in cmd/sync/ and as part of making a release run "make commanddocs"
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---
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# rclone sync
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Make source and dest identical, modifying destination only.
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## Synopsis
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Sync the source to the destination, changing the destination
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only. Doesn't transfer files that are identical on source and
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destination, testing by size and modification time or MD5SUM.
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Destination is updated to match source, including deleting files
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if necessary (except duplicate objects, see below). If you don't
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want to delete files from destination, use the
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[copy](/commands/rclone_copy/) command instead.
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**Important**: Since this can cause data loss, test first with the
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`--dry-run` or the `--interactive`/`-i` flag.
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rclone sync --interactive SOURCE remote:DESTINATION
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Note that files in the destination won't be deleted if there were any
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errors at any point. Duplicate objects (files with the same name, on
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those providers that support it) are also not yet handled.
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It is always the contents of the directory that is synced, not the
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directory itself. So when source:path is a directory, it's the contents of
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source:path that are copied, not the directory name and contents. See
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extended explanation in the [copy](/commands/rclone_copy/) command if unsure.
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If dest:path doesn't exist, it is created and the source:path contents
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go there.
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It is not possible to sync overlapping remotes. However, you may exclude
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the destination from the sync with a filter rule or by putting an
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exclude-if-present file inside the destination directory and sync to a
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destination that is inside the source directory.
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Rclone will sync the modification times of files and directories if
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the backend supports it. If metadata syncing is required then use the
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`--metadata` flag.
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Note that the modification time and metadata for the root directory
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will **not** be synced. See https://github.com/rclone/rclone/issues/7652
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for more info.
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**Note**: Use the `-P`/`--progress` flag to view real-time transfer statistics
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**Note**: Use the `rclone dedupe` command to deal with "Duplicate object/directory found in source/destination - ignoring" errors.
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See [this forum post](https://forum.rclone.org/t/sync-not-clearing-duplicates/14372) for more info.
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# Logger Flags
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The `--differ`, `--missing-on-dst`, `--missing-on-src`, `--match` and `--error` flags write paths, one per line, to the file name (or
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stdout if it is `-`) supplied. What they write is described in the
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help below. For example `--differ` will write all paths which are
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present on both the source and destination but different.
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The `--combined` flag will write a file (or stdout) which contains all
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file paths with a symbol and then a space and then the path to tell
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you what happened to it. These are reminiscent of diff files.
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- `= path` means path was found in source and destination and was identical
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- `- path` means path was missing on the source, so only in the destination
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- `+ path` means path was missing on the destination, so only in the source
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- `* path` means path was present in source and destination but different.
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- `! path` means there was an error reading or hashing the source or dest.
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The `--dest-after` flag writes a list file using the same format flags
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as [`lsf`](/commands/rclone_lsf/#synopsis) (including [customizable options
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for hash, modtime, etc.](/commands/rclone_lsf/#synopsis))
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Conceptually it is similar to rsync's `--itemize-changes`, but not identical
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-- it should output an accurate list of what will be on the destination
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after the sync.
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Note that these logger flags have a few limitations, and certain scenarios
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are not currently supported:
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- `--max-duration` / `CutoffModeHard`
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- `--compare-dest` / `--copy-dest`
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- server-side moves of an entire dir at once
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- High-level retries, because there would be duplicates (use `--retries 1` to disable)
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- Possibly some unusual error scenarios
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Note also that each file is logged during the sync, as opposed to after, so it
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is most useful as a predictor of what SHOULD happen to each file
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(which may or may not match what actually DID.)
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```
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rclone sync source:path dest:path [flags]
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```
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## Options
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```
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--absolute Put a leading / in front of path names
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--combined string Make a combined report of changes to this file
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--create-empty-src-dirs Create empty source dirs on destination after sync
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--csv Output in CSV format
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--dest-after string Report all files that exist on the dest post-sync
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--differ string Report all non-matching files to this file
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-d, --dir-slash Append a slash to directory names (default true)
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--dirs-only Only list directories
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--error string Report all files with errors (hashing or reading) to this file
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--files-only Only list files (default true)
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-F, --format string Output format - see lsf help for details (default "p")
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--hash h Use this hash when h is used in the format MD5|SHA-1|DropboxHash (default "md5")
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-h, --help help for sync
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--match string Report all matching files to this file
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--missing-on-dst string Report all files missing from the destination to this file
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--missing-on-src string Report all files missing from the source to this file
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-s, --separator string Separator for the items in the format (default ";")
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-t, --timeformat string Specify a custom time format, or 'max' for max precision supported by remote (default: 2006-01-02 15:04:05)
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```
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## Copy Options
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Flags for anything which can Copy a file.
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```
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--check-first Do all the checks before starting transfers
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-c, --checksum Check for changes with size & checksum (if available, or fallback to size only).
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--compare-dest stringArray Include additional comma separated server-side paths during comparison
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--copy-dest stringArray Implies --compare-dest but also copies files from paths into destination
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--cutoff-mode HARD|SOFT|CAUTIOUS Mode to stop transfers when reaching the max transfer limit HARD|SOFT|CAUTIOUS (default HARD)
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--ignore-case-sync Ignore case when synchronizing
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--ignore-checksum Skip post copy check of checksums
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--ignore-existing Skip all files that exist on destination
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--ignore-size Ignore size when skipping use modtime or checksum
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-I, --ignore-times Don't skip items that match size and time - transfer all unconditionally
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--immutable Do not modify files, fail if existing files have been modified
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--inplace Download directly to destination file instead of atomic download to temp/rename
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--max-backlog int Maximum number of objects in sync or check backlog (default 10000)
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--max-duration Duration Maximum duration rclone will transfer data for (default 0s)
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--max-transfer SizeSuffix Maximum size of data to transfer (default off)
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-M, --metadata If set, preserve metadata when copying objects
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--modify-window Duration Max time diff to be considered the same (default 1ns)
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--multi-thread-chunk-size SizeSuffix Chunk size for multi-thread downloads / uploads, if not set by filesystem (default 64Mi)
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--multi-thread-cutoff SizeSuffix Use multi-thread downloads for files above this size (default 256Mi)
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--multi-thread-streams int Number of streams to use for multi-thread downloads (default 4)
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--multi-thread-write-buffer-size SizeSuffix In memory buffer size for writing when in multi-thread mode (default 128Ki)
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--no-check-dest Don't check the destination, copy regardless
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--no-traverse Don't traverse destination file system on copy
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--no-update-dir-modtime Don't update directory modification times
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--no-update-modtime Don't update destination modtime if files identical
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--order-by string Instructions on how to order the transfers, e.g. 'size,descending'
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--partial-suffix string Add partial-suffix to temporary file name when --inplace is not used (default ".partial")
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--refresh-times Refresh the modtime of remote files
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--server-side-across-configs Allow server-side operations (e.g. copy) to work across different configs
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--size-only Skip based on size only, not modtime or checksum
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--streaming-upload-cutoff SizeSuffix Cutoff for switching to chunked upload if file size is unknown, upload starts after reaching cutoff or when file ends (default 100Ki)
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-u, --update Skip files that are newer on the destination
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```
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## Sync Options
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Flags just used for `rclone sync`.
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```
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--backup-dir string Make backups into hierarchy based in DIR
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--delete-after When synchronizing, delete files on destination after transferring (default)
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--delete-before When synchronizing, delete files on destination before transferring
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--delete-during When synchronizing, delete files during transfer
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--fix-case Force rename of case insensitive dest to match source
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--ignore-errors Delete even if there are I/O errors
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--max-delete int When synchronizing, limit the number of deletes (default -1)
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--max-delete-size SizeSuffix When synchronizing, limit the total size of deletes (default off)
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--suffix string Suffix to add to changed files
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--suffix-keep-extension Preserve the extension when using --suffix
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--track-renames When synchronizing, track file renames and do a server-side move if possible
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--track-renames-strategy string Strategies to use when synchronizing using track-renames hash|modtime|leaf (default "hash")
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```
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## Important Options
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Important flags useful for most commands.
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```
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-n, --dry-run Do a trial run with no permanent changes
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-i, --interactive Enable interactive mode
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-v, --verbose count Print lots more stuff (repeat for more)
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```
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## Filter Options
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Flags for filtering directory listings.
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```
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--delete-excluded Delete files on dest excluded from sync
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--exclude stringArray Exclude files matching pattern
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--exclude-from stringArray Read file exclude patterns from file (use - to read from stdin)
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--exclude-if-present stringArray Exclude directories if filename is present
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--files-from stringArray Read list of source-file names from file (use - to read from stdin)
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--files-from-raw stringArray Read list of source-file names from file without any processing of lines (use - to read from stdin)
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-f, --filter stringArray Add a file filtering rule
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--filter-from stringArray Read file filtering patterns from a file (use - to read from stdin)
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--ignore-case Ignore case in filters (case insensitive)
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--include stringArray Include files matching pattern
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--include-from stringArray Read file include patterns from file (use - to read from stdin)
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--max-age Duration Only transfer files younger than this in s or suffix ms|s|m|h|d|w|M|y (default off)
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--max-depth int If set limits the recursion depth to this (default -1)
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--max-size SizeSuffix Only transfer files smaller than this in KiB or suffix B|K|M|G|T|P (default off)
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--metadata-exclude stringArray Exclude metadatas matching pattern
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--metadata-exclude-from stringArray Read metadata exclude patterns from file (use - to read from stdin)
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--metadata-filter stringArray Add a metadata filtering rule
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--metadata-filter-from stringArray Read metadata filtering patterns from a file (use - to read from stdin)
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--metadata-include stringArray Include metadatas matching pattern
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--metadata-include-from stringArray Read metadata include patterns from file (use - to read from stdin)
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--min-age Duration Only transfer files older than this in s or suffix ms|s|m|h|d|w|M|y (default off)
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--min-size SizeSuffix Only transfer files bigger than this in KiB or suffix B|K|M|G|T|P (default off)
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```
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## Listing Options
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Flags for listing directories.
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```
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--default-time Time Time to show if modtime is unknown for files and directories (default 2000-01-01T00:00:00Z)
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--fast-list Use recursive list if available; uses more memory but fewer transactions
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```
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See the [global flags page](/flags/) for global options not listed here.
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# SEE ALSO
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* [rclone](/commands/rclone/) - Show help for rclone commands, flags and backends.
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