Man page: http://aolserver.com/docs/tcl/ns_cp.html
ns_cp - Copy one file to another.
ns_cp ?-preserve? file1 file2
ns_cp copies the contents of file1 to file2, just like the Unix "cp" command. The default directory is the home directory for the server.
If -preserve is specified, the copied file will retain the creation time, modification time, owner, and mode of the original file, just like the Unix "cp -p" command.
Tcl [file copy], ns_cpfp