$ ls -l plan9port.tgz lrwxr-xr-x 1 rsc users 22 Mar 20 00:01 plan9port.tgz -> plan9port-20130320.tgz $ sha1sum plan9port.tgz 741fe47d746a70298e375a6cc41346827148f455 plan9port.tgz $ md5sum plan9port.tgz 745e763231398337360a760d8d8b0f3c plan9port.tgz $