9/20/2023 0 Comments Grsync linux![]() ![]() Now any files under /target/dir/copy that are not also present under /source/dir/to/copy will be deleted. Rsync -aZP –delete /source/dir/to/copy /target/dir/ To do this you simply add the –delete option to rsync. To do that you want files on the target destination side to be deleted if they do not exist at the source. Sometimes you want to the target destination to become an exact copy of the source, aka “a mirror”. In the simple example above, if there are files in the target destination that are not present at the source, they will be left alone and not touched. Try to maintain hard links within transfered files Other common options you may which to use: The key rule here to remember is use the -Z option when you are rsyncing files INTO your group storage areas On all Martinos CentOS7 machines, we have defined a global option alias -Z that does the above. So instead you should run rsync with the following options: When you are copying data to one of your share groups areas, this can be problematic as it will ignore the sticky group bit as discussed in Understanding Group Permissions in UNIX. With the -a option the rsync will try to preserve both the exact permissions and group of the source. Normally you NEVER want a trailing slash on the source directory but you DO want a trailing slash on the target directory. GOTCHA WARNING: one thing to be careful of is trailing slashes. If your intention was to move the data instead of just copy, you would then just run Also, you can add -P to get a progress bar on each files which is helpful when you have very large files. If you want to see each file that gets copied as it rsync looks at each file and only copies over what is not present or is different at the target destination. In fact you should do this to verify the copy. You can at this point actually run the exactly same command again. The end result will be a copy of /source/dir/to/copy located at /target/dir/copy. ![]() Rsync -avP /source/dir/to/copy /target/dir/ Take a look at this example of copying /source/dir/to/copy into /target/dir Don’t let that apparent complexity scare you. If you look at the man page for rsync you will see it has a ton of options. The rsync utility is a very advanced file transfer utility that solves these issues. This same issue applies to the SSH copy utility scp. Even for a plain copy, restarting the copy is less than ideal as it will recopy everything that already got copied. ![]() When that happens on a move operation, your data will be in a inconsistant state with part of it still in the original location and part of it in the target destination. Since the operations can take a long time, there is a fair chance something will happen to interrupt or stop the copy or move. These latter features may be used to override decisions made by apt-get's conflict resolution system.When copying or moving large numbers of files, the generic UNIX utilities cp and mv are actually dangerous. Similarly a plus sign can be used to designate a package to install. If a hyphen is appended to the package name (with no intervening space), the identified package will be removed if it is installed. The /etc/apt/sources.list file is used to locate the desired packages. All packages required by the package(s) specified for installation will also be retrieved and installed. Each package is a package name, not a fully qualified filename. APT simplifies the process of managing software on Unix-like computer systems by automating the retrieval, configuration and installation of software packages, either from precompiled files or by compiling source code.Īpt-get is the command-line tool for handling packages, and may be considered the user's "back-end" to other tools using the APT library.Īpt-get install is followed by one or more packages desired for installation or upgrading. More information about install using apt-getĪdvanced Package Tool, or APT, is a free software user interface that works with core libraries to handle the installation and removal of software on Debian, Ubuntu and other Linux distributions. ![]()
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