copy
Copies file.
Appeal:
int err = shell_func("file", "copy", string spath_from, string spath_to);
Here:
spath_from is the path to the file from which we are copying,
spath_to is the path to the file to which we are copying.
Return value:
0 - copying was successful;
-2222 - source file not found;
-2223 - the file already exists;
-2224 - the device is full;
-2225 - insufficient user rights.
-1 is a general error.