Write a C program dircmx that copies or moves an entire directory sub-tree rooted at a specific

path in the home directory to a specific destination folder (also in the home directory) along with

only those file types specified by the extension list.

Synopsis :

dircmx [source_dir] [destination_dir] [options]

Both source_dir and destination_dir can be either absolute or relative paths, but must

belong to the home directory hierarchy.

If the destination_dir folder is not present in the home directory hierarchy, it must be

created

Options

o -cp copy the directory rooted at source_dir to destination_dir and do not delete

the directory rooted at source_dir

o -mv move the directory rooted at source_dir to destination_dir and delete the

sub-tree rooted at source_dir

Extension List: up to 6 file extensions can provided ( c , pdf, txt etc.)

o If the file extensions are listed with -cp, only those file types listed in the

extension must be copied (along with the tree rooted at source_dir to the

destination_dir. All the folders must be copied as per the hierarchy.

o If extensions are listed with -mv , only those file types must be moved (along with

the tree rooted at source_dir to the destination_dir. All the folders must be copied

as per the original hierarchy and the directory sub-tree rooted at source_dir must

be deleted.

o If the extension list is not provided, all files and folders must copied or moved

depending on -cp or -mv

Requirement:

You must use the system call nftw() that allows you to traverse a file tree. This system call will

recursively visit all the files/directories present in the tree and will call you own function (a

function that you pass as a parameter). You need to read the manual of nftw() before you start

working on your assignment.

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Sample Runs

$ dircmx ./folder1 ./folder2/folder3 -cp txt pdf

o This will copy the entire directory tree rooted at ./folder1 to ./folder2/folder3 and

will only copy .txt and .pdf files into the respective folders in the hierarchy

$ dircmx ~/folder1 ~/folder3 -mv

o This will move the entire directory tree rooted at ~/folder1 to ~/folder3 (along

with all the files and folders as per the source_dir hierarchy. The original directory

tree rooted at source_dir will be deleted.

Appropriate error messages must be displayed by the program based on the specifications.