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Use scp for a simple, one-time transfer; use rsync over SSH when you will repeat the job or move a large directory tree; and use sftp when you need to browse and transfer files interactively. Every method requires network reachability, a valid account on the destination server, permission to read the source, and permission to write the destination.
The examples below assume you are running commands from a Linux shell, that server-a is the source and server-b is the destination, and that user is an account allowed to log in on the relevant host. Replace those placeholders with your real paths, hostnames and account names.
Choose the right transfer method
All three tools use the SSH access model in these examples, so they inherit SSH authentication, encryption and account permissions. Their practical differences are about workflow rather than a different security boundary.
| Tool | Best use | What it does well | Important limitation |
|---|---|---|---|
scp |
One-off file or directory copy | Short, familiar commands with little setup | Repeating a large transfer sends files again instead of synchronizing only changes |
rsync over SSH |
Backups, deployments, migrations and recurring synchronization | Compares source and destination and transfers differences; can preserve selected metadata | A normal local rsync process cannot address two arbitrary remote paths at once |
sftp |
Interactive file management | Browse, select, upload and download files in a session | Less convenient than a single command for scripting and less specialized than rsync for delta synchronization |
The OpenSSH manual describes scp as a tool that “copies files between hosts on a network.” The rsync manual calls rsync “a fast and extraordinarily versatile file copying tool.” Those descriptions match the decision above: scp minimizes command complexity, while rsync is built for repeated synchronization.
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Check connectivity and permissions first
A transfer can fail even when the network is working. Test the destination login and the exact destination directory before starting a large copy.
-
Confirm that the destination name resolves and SSH accepts your account:
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Check that the destination exists and is writable by that account:
ssh user@server-b 'test -d /remote/path && test -w /remote/path'No output and an exit status of zero means both tests passed. A failed test means you should correct the path or permissions before transferring.
-
Inspect the source path and its ownership:
ls -l /source/path
Successful SSH authentication does not imply write access to every directory. A destination such as /srv/app may be writable only by a service account or by root. Use a dedicated account with only the permissions required for the transfer. If ownership must be preserved, remember that the destination filesystem, account privileges and server policy may prevent an ordinary user from setting owner or group values.
Copy a file with scp
For a one-time transfer, scp is usually the shortest path from source to destination. Its syntax is:
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Copy a directory recursively
Add -r when the source is a directory:
scp -r /local/path/directory user@server-b:/remote/path/This normally creates /remote/path/directory and copies its contents beneath it. If you want only the directory’s contents in an existing destination, specify the contents explicitly or use rsync, whose trailing-slash behavior is easier to control for that case.
Download from another server
Reverse the source and destination to pull a file to the machine where you are working:
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scp user@server-a:/remote/path/file /local/path/You can also pull a directory recursively:
scp -r user@server-a:/remote/path/directory /local/path/Use a particular SSH key
If the account requires an identity file that is not your default key, add -i:
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What scp does not solve
Scp is not a synchronization database. If you run the same command again, it does not generally calculate a block-level delta for a changed large file; it copies the file according to its normal transfer behavior. For recurring jobs, interrupted transfers or trees containing many unchanged files, rsync is usually the better fit.
Synchronize files with rsync over SSH
Rsync can copy to or from a remote host through a remote shell such as SSH. Its delta-transfer algorithm compares the source and destination and sends only the differences it can identify, which reduces work on repeat transfers. The command most people need is:
rsync -avP /local/path/ user@server-b:/remote/path/Here, -a requests archive behavior, -v increases the detail printed in the terminal, and -P combines progress information with retention of partial files. Archive mode requests preservation of common attributes and recursive copying, but the result remains subject to destination permissions, filesystem support and the account running rsync.
Understand the trailing slash
The slash on the source changes the destination layout:
/local/path/means “copy the contents ofpathinto the destination.”/local/pathgenerally means “copy the directory namedpathitself under the destination.”
For example, with a destination of /remote/path/, the first form places files such as report.csv at /remote/path/report.csv, while the second generally produces /remote/path/path/report.csv. Check this detail before a deployment or migration.
Preview changes with a dry run
Use --dry-run to see what rsync would change without copying data:
rsync -avP --dry-run /local/path/ user@server-b:/remote/path/Review the listed paths, especially when the source and destination differ only by a missing or extra trailing slash. Remove --dry-run only after the proposed file set and destination are correct.
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Copy a remote tree back to the local machine
Put the remote path first to pull data:
rsync -avP user@server-a:/remote/path/ /local/path/The same archive, verbosity and partial-file considerations apply in the opposite direction.
Metadata, links and privileges
Archive mode requests preservation of links, permissions, timestamps and other metadata, and rsync has options for links, devices, owners and groups. It cannot override the destination’s rules. An unprivileged account may be unable to create device files, set another user’s ownership or apply a mode that the filesystem rejects. If exact ownership is required, arrange the transfer with an appropriately privileged account or perform a controlled ownership step on the destination after the copy. Do not grant broad root access merely to make a transfer convenient.
Remote-to-remote transfers with rsync
A commonly misunderstood command is:
rsync -avP user@server-a:/remote/path/ user@server-b:/remote/path/A standard rsync process started on your local machine does not support arbitrary copying between two remote hosts. The rsync manual explicitly limits the normal model to a local path and one remote host. To move data between two servers, run rsync on one endpoint (or use a deliberate staging design).
Run rsync on the source server
Log in to server-a and have it send directly to server-b:
ssh user@server-a 'rsync -avP /remote/path/ user@server-b:/remote/path/'This requires the account on server-a to read the source and the account used for server-b to authenticate and write there. If the source account and destination account differ, specify the appropriate destination account explicitly.
Use a local staging directory
When direct server-to-server authentication is not allowed, copy to a controlled local staging directory, verify the result, and then send it onward:
rsync -avP user@server-a:/remote/path/ /local/staging/path/
rsync -avP /local/staging/path/ user@server-b:/remote/path/Staging consumes local disk space and adds a second transfer, but it makes inspection, malware scanning, retention and rollback easier.
Use SFTP for an interactive session
SFTP is useful when you need to browse directories, transfer several selected files or issue file-management commands as you work. Start a session with:
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sftp user@server-bAt the sftp> prompt, upload one file or a whole directory:
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sftp> put /local/path/file /remote/path/file
sftp> put -r /local/path/directory /remote/path/
sftp> exitYou can use the session to inspect locations and select individual files instead of constructing a separate command for each one. The SFTP command set also includes remote permission changes with chmod; use that only when the account is authorized to alter the target mode.
When SFTP is preferable
- Several unrelated files need to be uploaded or downloaded during one connection.
- You need to browse the remote directory before deciding what to copy.
- A person, rather than a scheduled script, is choosing files interactively.
For a scripted one-off, one scp command is simpler. For recurring synchronization, rsync’s comparison and delta behavior are more specialized.
Set up key-based authentication for repeat transfers
Typing a password for every scheduled or repeated copy is both inconvenient and difficult to automate safely. Install a public key on the destination account with ssh-copy-id:
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ssh-copy-id user@server-bThe command installs your public key in the remote account’s authorized_keys file. After it completes, test the account:
ssh user@server-b 'id'Then run the transfer normally:
rsync -avP /local/path/ user@server-b:/remote/path/Keep the private key readable only by its intended user. For unattended jobs, protect the key with an agent or an approved secret-management process, restrict the destination account’s permissions and limit the key’s use where your SSH policy permits. A key removes interactive password entry; it does not remove the need to authorize the account and protect the server.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Verify a transfer instead of assuming success
Do not treat a returned shell prompt as proof that every expected file arrived. Check the destination and compare the important properties.
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List the destination contents:
ssh user@server-b 'ls -l /remote/path/' -
For a directory synchronized with rsync, repeat the command with
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Check a critical file’s size and checksum on both hosts. For example:
sha256sum /local/path/file
ssh user@server-b 'sha256sum /remote/path/file' -
Open or test the transferred data with the application that will use it. A file can have the expected name and size but still be unusable because of permissions, an incomplete application-level transaction or an incompatible format.
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When a transfer is interrupted, rsync with -P can retain partial data for a later continuation. Inspect the result before treating a resumed job as complete.
Troubleshoot common failures
“Permission denied” on the destination
Confirm the account and directory independently:
ssh user@server-b 'id && test -d /remote/path && test -w /remote/path'If the directory is not writable, copy to a directory the account owns, ask an administrator to grant the minimum required access, or use an approved privileged workflow. Do not assume that adding -a or -r can bypass filesystem permissions.
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“No such file or directory”
Check both sides for spelling, case and path context. A relative path is interpreted from the shell’s current directory; an absolute path such as /var/data/file is unambiguous. On the destination, create the parent directory through an authorized account before starting the transfer.
Authentication or key errors
First test plain SSH with the same account and host. If that fails, fix hostname resolution, network access, the SSH service, account authorization or key permissions before debugging scp or rsync. If you need a non-default key, include -i /path/to/key in scp or configure the corresponding SSH identity for rsync.
Unexpected directory nesting
Inspect whether the rsync source ended in a slash. Use --dry-run and correct /source/ versus /source before repeating the real copy.
Rsync reports metadata errors
Read the specific warning rather than discarding it. Ownership, groups, device files, links and modes may require privileges or filesystem features unavailable to the destination account. Decide which metadata is actually required, then adjust the account, destination or rsync options deliberately.
Remote-to-remote rsync fails immediately
Do not keep adding flags to a two-remote-path command. Run rsync on one server through SSH, or use a local staging directory as shown earlier. The topology, not the progress option, is the problem.
Security and operational practices
- Use hostnames or addresses you have verified, and check the SSH host-key prompt before accepting a new identity.
- Use a transfer account limited to the source files and destination directory it needs.
- Prefer key authentication for repeat jobs, protect private keys and avoid embedding passwords in shell history or scripts.
- Use
--dry-runbefore an rsync command that could overwrite or delete important data. The commands in this guide do not include deletion options; adding one requires a separate backup and rollback plan. - Transfer into a temporary destination and rename it into place when an application must never observe a partially populated release. Coordinate that procedure with the application’s own locking and ownership requirements.
- Record which account, source path, destination path and metadata expectations a scheduled job uses. A future administrator should be able to reproduce or safely stop it.
A practical decision checklist
- One file or one directory, one time: use
scp, adding-rfor a directory and-iwhen a specific key is needed. - Recurring copy, backup or large tree: use
rsync -avPover SSH, verify the trailing slash and preview with--dry-run. - Several manually selected files: open an
sftpsession and useputorput -r. - Two remote servers: run rsync on one endpoint or stage the files locally; a normal local rsync command cannot directly connect two remote paths.
- Repeated automation: install a public key with
ssh-copy-id, restrict the account and verify permissions before scheduling the job.
The deciding factors are workflow, not just speed: scp is the straightforward copier, rsync is the synchronizer, and SFTP is the interactive file manager. In every case, validate connectivity, account authorization and destination write access before moving data.
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