Get files from a directory tree maintaining the directory structure


How to copy limited files from a directory tree to a target while maintaining the directory structure of the source

 

rsync is designed to make duplicates of a tree structure. While normally used to replicate a tree across the network, it is a fast, efficient tool to make local copies of of files also.

 

Using the filtering rules available, rsync can limit the files copied while maintaining the full directory structure. The syntax is:

rsync -av --prune-empty-dirs --exclude-from=exclude_file source dest

where exclude_file, source, and dest are, respectively, a file containing filtering rules, the source directory, and the target directory.

-av means run in archive mode and give verbose output

--prune-empty-dirs says to not copy any empty directories (otherwise the tree structure is copied)

 

exclude_file is the important part of this. It is a series of rules, one per line, which are processed in file order. The first item in a rule is a plus sign or a minus sign signifying include or exclude. This is followed by a space, then the matching text (see man rsync for more information). Comments can have a pound sign (#) in the first column, in which case the entire line is ignored. I have done this in the following to document what the following line does, though normally I don't bother for one-offs.

 

Sample exclude_file to copy all menu items and desktop links from a Windows Documents and Settings tree

 

# include all subdirectories, one level down
+ */ # include include all files and folders (full tree) below directory Start Menu
+ /*/Start Menu/** # include anything in directory Desktop that has a .lnk extension, from full tree
+ /*/Desktop/**.lnk # do not include anything else
- *

 

The above is a real world example where the menus and desktop links were lost for all users on a Windows 2003 terminal server due to a virus. There was a full backup of c:\Documents and Settings on a unix machine and I recovered them with the following commands:

cd ~
mkdir recovered
# create the a file getMenus in the current directory containing the above rsync --prune-empty-dirs -av --exclude-from=./getMenus /home/backups/backup/server/ recovered
zip -r menu.zip recovered/

 

This created a zip file (transferable to the Windows machine) which  could be unpacked over c:\Documents and Settings to recover the missing links.

Last update:
2014-09-25 02:50
Author:
Rod
Revision:
1.6
Average rating:0 (0 Votes)

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