cleanname - clean a path name cleanname [ -d pwd ] names ... For each file name argument, cleanname , by lexical processing only, prints the shortest equivalent string that names the same (possibly hypothetical) file. It eliminates multiple and trailing slashes, and it lexically interprets . and .. directory components in the name. If the -d option is present, unrooted names are prefixed with pwd / before processing. /sys/src/cmd/cleanname.c cleanname (2).