new utilities.

the .C files compile but are renamed to avoid building automatically.

src/cmd/basename.c

@@ -0,0 +1,41 @@
+#include <u.h>
+#include <libc.h>
+
+void
+main(int argc, char *argv[])
+{
+	char *pr;
+	int n, dflag;
+
+	dflag = 0;
+	if(argc>1 && strcmp(argv[1], "-d") == 0){
+		--argc;
+		++argv;
+		dflag = 1;
+	}
+	if(argc < 2 || argc > 3){
+		fprint(2, "usage: basename [-d] string [suffix]\n");
+		exits("usage");
+	}
+	pr = utfrrune(argv[1], '/');
+	if(dflag){
+		if(pr){
+			*pr = 0;
+			print("%s\n", argv[1]);
+			exits(0);
+		}
+		print(".\n");
+		exits(0);
+	}
+	if(pr)
+		pr++;
+	else
+		pr = argv[1];
+	if(argc==3){
+		n = strlen(pr)-strlen(argv[2]);
+		if(n >= 0 && !strcmp(pr+n, argv[2]))
+			pr[n] = 0;
+	}
+	print("%s\n", pr);
+	exits(0);
+}