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Full Discussion: UNIX - SCP File Transfer
Top Forums UNIX for Advanced & Expert Users UNIX - SCP File Transfer Post 302184019 by tderscheid on Thursday 10th of April 2008 09:55:46 AM
Old 04-10-2008
I'm missing some of the bigger-picture elements

Quote:
Originally Posted by vijaykrc

can i delete each file when the copy is done?
If i use SCP by looping i know it can be done but it takes lot of time if i have more files. If i use the * to transfer multiple files it goes in quickly as it dont have to connect every time to the server.
Well, are you generating all the files once, then moving all the files, then deleting all the files, with nothing touching the directory during the transfer? If so, then if your scp /$sourcepath/* has finished with exit code 0, it's reporting success, so the files got to the target machine. As long as nothing has generated more source files, then you could rm /$sourcepath/* and be happy, or depending on your available space, tar them and save them for a week.

How much time are you losing during the connection process? Aren't you ultimately going to automate this and just drink coffee while the move script runs from crontab and then sends you an email of the log when it's done? Is the time you lose actually a critical factor?

If you're having to move, daily, a million tiny files from server A to server B, something else is wrong with that picture. Would server B accept a tar.gz of each group of files you want to send?

I am sure Era can find several other angles to improve this. A little more information about the timeline of file creation might be useful.
 

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SCP(1)							    BSD General Commands Manual 						    SCP(1)

NAME
scp -- secure copy (remote file copy program) SYNOPSIS
scp [-346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file] [-l limit] [-o ssh_option] [-P port] [-S program] [[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 secu- rity as ssh(1). scp will ask for passwords or passphrases if they are needed for authentication. File names may contain a user and host specification to indicate that the file is to be copied to/from that host. Local file names can be made explicit using absolute or relative pathnames to avoid scp treating file names containing ':' as host specifiers. Copies between two remote hosts are also permitted. The options are as follows: -3 Copies between two remote hosts are transferred through the local host. Without this option the data is copied directly between the two remote hosts. Note that this option disables the progress meter. -4 Forces scp to use IPv4 addresses only. -6 Forces scp to use IPv6 addresses only. -B Selects batch mode (prevents asking for passwords or passphrases). -C Compression enable. Passes the -C flag to ssh(1) to enable compression. -c cipher Selects the cipher to use for encrypting the data transfer. This option is directly passed to ssh(1). -F ssh_config Specifies an alternative per-user configuration file for ssh. This option is directly passed to ssh(1). -i identity_file Selects the file from which the identity (private key) for public key authentication is read. This option is directly passed to ssh(1). -l limit Limits the used bandwidth, specified in Kbit/s. -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. For full details of the options listed below, and their possible values, see ssh_config(5). AddressFamily BatchMode BindAddress CanonicalDomains CanonicalizeFallbackLocal CanonicalizeHostname CanonicalizeMaxDots CanonicalizePermittedCNAMEs CertificateFile ChallengeResponseAuthentication CheckHostIP Ciphers Compression ConnectionAttempts ConnectTimeout ControlMaster ControlPath ControlPersist GlobalKnownHostsFile GSSAPIAuthentication GSSAPIDelegateCredentials HashKnownHosts Host HostbasedAuthentication HostbasedKeyTypes HostKeyAlgorithms HostKeyAlias HostName IdentitiesOnly IdentityAgent IdentityFile IPQoS KbdInteractiveAuthentication KbdInteractiveDevices KexAlgorithms LogLevel MACs NoHostAuthenticationForLocalhost NumberOfPasswordPrompts PasswordAuthentication PKCS11Provider Port PreferredAuthentications ProxyCommand ProxyJump PubkeyAcceptedKeyTypes PubkeyAuthentication RekeyLimit SendEnv ServerAliveInterval ServerAliveCountMax StrictHostKeyChecking TCPKeepAlive UpdateHostKeys UsePrivilegedPort User UserKnownHostsFile VerifyHostKeyDNS -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. -p Preserves modification times, access times, and modes from the original file. -q Quiet mode: disables the progress meter as well as warning and diagnostic messages from ssh(1). -r Recursively copy entire directories. Note that scp follows symbolic links encountered in the tree traversal. -S program Name of program to use for the encrypted connection. The program must understand ssh(1) options. -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. EXIT STATUS
The scp utility exits 0 on success, and >0 if an error occurs. SEE ALSO
sftp(1), ssh(1), ssh-add(1), ssh-agent(1), ssh-keygen(1), ssh_config(5), sshd(8) HISTORY
scp is based on the rcp program in BSD source code from the Regents of the University of California. AUTHORS
Timo Rinne <tri@iki.fi> Tatu Ylonen <ylo@cs.hut.fi> BSD
May 3, 2017 BSD
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