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Top Forums UNIX for Dummies Questions & Answers Copy files from one drive to another, keeping most recently modified files Post 302898421 by apocolapse on Tuesday 22nd of April 2014 05:47:02 AM
Old 04-22-2014
Question Copy files from one drive to another, keeping most recently modified files

Hi all, I am a bit of a beginner with shell scripting..

What I want to do is merge two drives, for example moving all data from X to Y.

If a file in X doesn't exist in Y, it will be moved there.
If a file in X also exists in Y, the most recently modified file will be moved to (or kept) in Y.

I have done some reading on the forums and it seems rsync could be helpful, but the most important factor in this exercise is to only keep the most recently modified file, which I am not sure rsync does...

Do any of you have any recommendations? Thanks for the help!
 

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vzmigrate(8)							    Containers							      vzmigrate(8)

NAME
vzmigrate - migrate a container between two OpenVZ servers SYNOPSIS
vzmigrate [-r|--remove-area yes|no] [--ssh=ssh_options] [--rsync=rsync_options] [--keep-dst] [--online] [-v] destination_address CTID DESCRIPTION
This utility is used to migrate a container from one (source) Hardware Node (HN) to another (destination) HN. The utility can migrate either stopped or running container. For a stopped container, simple CT private area transfer is performed (rsync(1) is used for file transfer). For running containers, migration may be offline (default) or online. This program uses ssh as a transport layer. You will need to put ssh public key to destination node and be able to connect to node without entering password. OPTIONS
-r, --remove-area yes | no Whether to remove a container area on source HN for the successfully migrated container. Default is yes. --ssh=options Additional options that will be passed to ssh while establishing connection to destination HN. --rsync=options Additional options that will be passed to rsync(8). You may add options like -z to enable data compression if you are migrating over a slow link. --keep-dst Do not clean synced destination container private area in case of some error. It makes sense to use this option on big container migration to avoid syncing container private area again in case some error (on container stop for example) occurs during first migration attempt. --online Perform online (zero-downtime) migration: during the migration the container hangs for a while and after the migration it continues working as though nothing has happened. -v Verbose mode. Causes vzmigrate to print debugging messages about its progress. Multiple -v options increase the verbosity. The maximum is 3. EXAMPLES
Migration of CT 101 to 192.168.1.130 with downtime: vzmigrate 192.168.1.130 101 Online migration of CT 102 to 192.168.1.130: vzmigrate --online 192.168.1.130 102 EXIT STATUS
0 EXIT_OK Command completed successfully. 1 EXIT_USAGE Bad command line options. 2 EXIT_VE_STOPPED Container is stopped. 4 EXIT_CONNECT Can't connect to destination (source) HN. 6 EXIT_COPY Container private area copying/moving failed. 7 EXIT_VE_START Can't start or restore destination CT. 8 EXIT_VE_STOP Can't stop or checkpoint source CT. 9 EXIT_EXISTS Container already exists on destination HN. 10 EXIT_NOTEXIST Container does not exists on source HN. 12 EXIT_IP_INUSE You attempt to migrate CT which IP address(es) are already in use on the destination node. 13 EXIT_QUOTA Operation with CT quota failed. SEE ALSO
rsync(1). COPYRIGHT
Copyright (C) 2001-2010, Parallels, Inc. Licensed under GNU GPL. OpenVZ 28 Jun 2011 vzmigrate(8)
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