`cp` for filesystem

Copy files using uutils/coreutils cp.

Signature

> cp {flags} ...rest

--recursive, -r: copy directories recursively
--verbose, -v: explicitly state what is being done
--force, -f: if an existing destination file cannot be opened, remove it and try again (this option is ignored when the -n option is also used). currently not implemented for windows
--interactive, -i: ask before overwriting files
--update, -u: copy only when the SOURCE file is newer than the destination file or when the destination file is missing
--progress, -p: display a progress bar
--no-clobber, -n: do not overwrite an existing file
--debug, -: explain how a file is copied. Implies -v

input	output
nothing	nothing

Copy myfile to dir_b

> cp myfile dir_b

Recursively copy dir_a to dir_b

> cp -r dir_a dir_b

Recursively copy dir_a to dir_b, and print the feedbacks

> cp -r -v dir_a dir_b

Move many files into a directory

> cp *.txt dir_a

Copy only if source file is newer than target file

> cp -u a b