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Top Forums Shell Programming and Scripting One directory, extracting only files to a new directoy Post 302954296 by Don Cragun on Sunday 6th of September 2015 08:30:42 PM
Old 09-06-2015
You're not bothering me! I just don't understand what you're trying to do.

Please show us a sample of the output produced by the command:
Code:
sha256sum file

with file replaced by the name of one of the files you are processing.

If you sort the output of sha256sum file on the field that contains the checksum it produces, then lines in the output with the same checksum would presumably be copies of each other.

But, if you have several files with the same name with different checksums, the checksum will not tell you anything at all about which file contains the longest recording nor about which file has the highest quality audio.

Please just explain how your code is supposed to determine which file you want to end up in your destination directory if more than one pathname in your source file hierarchy has the same final component.

The only thing in your current code that copies files into your destination directory is the simple command:
Code:
cp -nr /home/directory/origin /home/directory/destination

which will search the file hierarchy rooted in /home/directory/origin and copy every non-directory file it finds to /home/directory/destination that doesn't already exist in that directory. If there is more than one file in the source hierarchy with the same name, the first one encountered will be copied (if there isn't already a file in that directory with that name before the cp was invoked). The order in which cp searches the source hierarchy is unspecified.

Assuming that the destination directory exists at the time you invoke the above cp command, nothing in the commands you have shown us (except that cp command), has any affect on copying files nor on selecting which files will be copied to the destination directory.
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cp(1)							      General Commands Manual							     cp(1)

Name
       cp - copy file data

Syntax
       cp [ -f ] [ -i ] [ -p ] file1 file2

       cp [ -f ] [ -i ] [ -p ] [ -r ] file... directory

       cp [ -f ] [ -i ] [ -p ] [ -r ] directory... directory

Description
       The command copies file1 onto file2.  The mode and owner of file2 are preserved if it already existed; the mode of file1 is used otherwise.
       Note that the command will not copy a file onto itself.

       In the second form, one or more files are copied into the directory with their original file names.

       In the third form, one or more source directories are copied into the destination directory with their original file names.

Options
       -f   Forces existing destination pathnames to be removed before copying, without prompting for confirmation.  The -i option is  ignored	if
	    the -f option is specified.

       -i   Prompts  user  with  the name of file whenever the copy will cause an old file to be overwritten. A yes answer will cause to continue.
	    Any other answer will prevent it from overwriting the file.

       -p   Preserves (duplicates) in the copies the modification time, access time, file mode, user ID, and group ID as allowed  by  the  permis-
	    sions of the source files, ignoring the present umask.

       -r   Copies  directories.  Entire directory trees, including their subtrees and the individual files they contain, are copied to the speci-
	    fied destination directory. The directory, its subtrees, and the individual files retain their original names. For	example,  to  copy
	    the directory including all of its subtrees and files, into the directory enter the following command:
	    cp -r reports news

See Also
       cat(1), pr(1), mv(1)

																	     cp(1)
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