mac os x: secure delete, tar/gzip with resource fork
Discovered that on Mac Os X 10.6, tar, gzip, gunzip preserves resource fork by default. Updated at: Mac OS X Resource Fork and Command Line Tips.
Discovered that on the Mac, to securely delete files, just use the builtin command srm, like this: “srm -r -s dir_path”. For detail, see: Secure Deletion, File Shredding, on Windows, Linux, Mac.