SCP(1) BSD General Commands Manual SCP(1)
NAME
scp - secure copy (remote file copy program)
SYNOPSIS
scp [-pqrvBC1246] [-F ssh_config] [-S program] [-P port] [-c cipher]
[-i identity_file] [-l limit] [-o ssh_option] [[user@]host1:]file1
[...] [[user@]host2:]file2
DESCRIPTION
scp copies files between hosts on a network. It uses ssh(1) for data
transfer, and uses the same authentication and provides the same security
as ssh(1). Unlike rcp(1), scp will ask for passwords or passphrases if
they are needed for authentication.
Any file name may contain a host and user specification to indicate that
the file is to be copied to/from that host. Copies between two remote
hosts are permitted.
The options are as follows:
-c cipher
Selects the cipher to use for encrypting the data transfer. This
option is directly passed to ssh(1).
-i identity_file
Selects the file from which the identity (private key) for RSA
authentication is read. This option is directly passed to
ssh(1).
-l limit
Limits the used bandwidth, specified in Kbit/s.
-p Preserves modification times, access times, and modes from the
original file.
-r Recursively copy entire directories.
-v Verbose mode. Causes scp and ssh(1) to print debugging messages
about their progress. This is helpful in debugging connection,
authentication, and configuration problems.
-B Selects batch mode (prevents asking for passwords or
passphrases).
-q Disables the progress meter.
-C Compression enable. Passes the -C flag to ssh(1) to enable com-
pression.
-F ssh_config
Specifies an alternative per-user configuration file for ssh.
This option is directly passed to ssh(1).
-P port
Specifies the port to connect to on the remote host. Note that
this option is written with a capital `P', because -p is already
reserved for preserving the times and modes of the file in
rcp(1).
-S program
Name of program to use for the encrypted connection. The program
must understand ssh(1) options.
-o ssh_option
Can be used to pass options to ssh in the format used in
ssh_config(5). This is useful for specifying options for which
there is no separate scp command-line flag.
-1 Forces scp to use protocol 1.
-2 Forces scp to use protocol 2.
-4 Forces scp to use IPv4 addresses only.
-1 Forces scp to use protocol 1.
-1 Forces scp to use protocol 1.
-1 Forces scp to use protocol 1.
-1 Forces scp to use protocol 1.
-1 Forces scp to use protocol 1.
-2 Forces scp to use protocol 2.
-4 Forces scp to use IPv4 addresses only.
-6 Forces scp to use IPv6 addresses only.
DIAGNOSTICS
scp exits with 0 on success or >0 if an error occurred.
AUTHORS
Timo Rinne <> and Tatu Ylonen <>
HISTORY
scp is based on the rcp(1) program in BSD source code from the Regents ofthe University of California.
the University of California.
SEE ALSO
rcp(1), sftp(1), ssh(1), ssh-add(1), ssh-agent(1), ssh-keygen(1),
ssh_config(5), sshd(8)
BSD September 25, 1999 BSD
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~The command to secure copy a file in linux is scp.
How do I copy a file from one computer to another?
The general form is:
an example:
# scp joeshmoe@miles.shadlen.org:matlab/mfile.m matlab/
This will copy the file mfile.m from the matlab directory on miles to the directory matlab on whatever machine the user is on currently. If there is no directory matlab in the current directory, an error message will be returned. Either type out the whole pathway (~/matlab - if the directory matlab is in your home directory) or the pathway relative to your current directory (./ for current directory). The name of the file can also be printed in the target, which is useful if you want to give the file a new name in its new place. Let's say you wanted to copy the file example.m from your matlab directory (which is in your current directory) on the computer you are on, change the name to silly.m and place it in a directory called unfinished in your home directory on miles.
# scp example.m joeshmoe@miles.shadlen.org:unfinished/silly.m
The command to synchronize two directories (or two directory trees) so that they look the same is called rsync.
How do I sync two directories?
To update the files on a target to reflect changes you have made at a source, use
# rsync -avub -e ssh source target
where source and target are written according to scp syntax. For example, given ~/matlab/project/ directories on both merleau and localhost, you can type
# rsync -avub -e ssh ~/matlab/project merleau.rprc.washington.edu:matlab/
to update all the files in project on merleau to reflect the changes you have made to them on localhost. If the directory project does not exist on merleau inside the directory matlab, rsync will create it. And if you had typed matlab/project/ as the target, rsync would create another directory project inside the directory project. It is important whether there is a slash at the end of the source directory. A trailing / on a source name means "copy the contents of this directory". Without a trailing slash it means "copy the directory". The -b option copies all of the backup files as well, which can lead to excessive copies of backups, since sync used with these options does not delete any files. Rsync, used with this syntax, will not overwrite newer files in the target.
A little thought will convince you that a complete synchronization may require doing a rsync in both directions.
For more information,
If you have not installed the rsync package, you can get it from by following the trail to your appropriate linux distribution, eg rsync-2.4.4-1.i386.rpm for Red Hat 7.0.
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