cygwin - file copy to UNC share
UNC paths are mapped to Cygwin paths by replacing \ characters with / characters.
For example, a file that appears in Windows as
\\server\dir1\dir2\foo.txtshould appear in Cygwin as:
//server/dir1/dir2/foo.txtIf that doesn't work (it should), you can also map a drive letter to a UNC path. For example, if you map \\server\dir1 to S:\, then the same file (S:\dir2\foo.txt) should appear in Cygwin as /cygdrive/s/dir2/foo.txt.
In short, a Cygwin command can treat a directory with a UNC path as an ordinary directory.