$ ls -l mk-with-libs.tgz lrwxr-xr-x 1 rsc users 25 May 30 2011 mk-with-libs.tgz -> mk-with-libs-20110530.tgz $ sha1sum mk-with-libs.tgz 0156d7fb46968f456633d7507d7d90183c39d833 mk-with-libs.tgz $ md5sum mk-with-libs.tgz b4f5960b875258a08505e07f3404d639 mk-with-libs.tgz $