There is a folder with copies of dir2 files (a lot of files), there is also a folder with the originals of these files dir1 . Sometimes, files located in the dir1 folder are modified, which are displayed in the file property (for example: changed on 12/16/2016 at 16:40). From time to time , a copy of all files from dir1 to dir2 is made , it takes a very long time. How to write a bash script that would check if the original file has changed in dir1 and rewrite it in dir2 , and the file that has not been changed - skip it? Can this be realized through normal cp ? I did not find a pass key in it, if the same "ON DATE OF CHANGE" files are found. Thank.

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2 answers 2

cp -u

-up, -update;

cp

    You can use the rsync utility.

    rsync -a / dir1 / / dir2

    the first time will create an exact copy of the directory, all subsequent times will only copy files that have changed since the last synchronization

    • you can add recursive copying and saving modifications --recursive --times - Hellseher