new utilities.

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

src/cmd/echo.c

@@ -0,0 +1,38 @@
+#include <u.h>
+#include <libc.h>
+
+void
+main(int argc, char *argv[])
+{
+	int nflag;
+	int i, len;
+	char *buf, *p;
+
+	nflag = 0;
+	if(argc > 1 && strcmp(argv[1], "-n") == 0)
+		nflag = 1;
+
+	len = 1;
+	for(i = 1+nflag; i < argc; i++)
+		len += strlen(argv[i])+1;
+
+	buf = malloc(len);
+	if(buf == 0)
+		exits("no memory");
+
+	p = buf;
+	for(i = 1+nflag; i < argc; i++){
+		strcpy(p, argv[i]);
+		p += strlen(p);
+		if(i < argc-1)
+			*p++ = ' ';
+	}
+		
+	if(!nflag)
+		*p++ = '\n';
+
+	if(write(1, buf, p-buf) < 0)
+		fprint(2, "echo: write error: %r\n");
+
+	exits((char *)0);
+}